1025000520 has 128 divisors (see below), whose sum is σ = 3241347840. Its totient is φ = 258790400.

The previous prime is 1025000489. The next prime is 1025000527. The reversal of 1025000520 is 250005201.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1025000520.

It is not an unprimeable number, because it can be changed into a prime (1025000527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 276922 + ... + 280598.

It is an arithmetic number, because the mean of its divisors is an integer number (25323030).

Almost surely, 2^1025000520 is an apocalyptic number.

1025000520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1025000520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1620673920).

1025000520 is an abundant number, since it is smaller than the sum of its proper divisors (2216347320).

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

1025000520 is a wasteful number, since it uses less digits than its factorization.

1025000520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3815 (or 3811 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 1025000520 is about 32015.6293081988. The cubic root of 1025000520 is about 1008.2650081123.

Adding to 1025000520 its reverse (250005201), we get a palindrome (1275005721).

The spelling of 1025000520 in words is "one billion, twenty-five million, five hundred twenty", and thus it is an aban number.