1025621730 has 256 divisors, whose sum is σ = 3348034560. Its totient is φ = 218087424.

The previous prime is 1025621699. The next prime is 1025621761. The reversal of 1025621730 is 371265201.

It is a happy number.

1025621730 is a `hidden beast` number, since 1 + 0 + 2 + 5 + 621 + 7 + 30 = 666.

It is an interprime number because it is at equal distance from previous prime (1025621699) and next prime (1025621761).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1025621694 and 1025621703.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4401694 + ... + 4401926.

It is an arithmetic number, because the mean of its divisors is an integer number (13078260).

Almost surely, 2^1025621730 is an apocalyptic number.

1025621730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1025621730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1674017280).

1025621730 is an abundant number, since it is smaller than the sum of its proper divisors (2322412830).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1025621730 is a wasteful number, since it uses less digits than its factorization.

1025621730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410 (or 404 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 1025621730 is about 32025.3295065016. The cubic root of 1025621730 is about 1008.4686560788.

Adding to 1025621730 its reverse (371265201), we get a palindrome (1396886931).

The spelling of 1025621730 in words is "one billion, twenty-five million, six hundred twenty-one thousand, seven hundred thirty".