1021612540 has 48 divisors (see below), whose sum is σ = 2326010400. Its totient is φ = 374664960.

The previous prime is 1021612519. The next prime is 1021612541. The reversal of 1021612540 is 452161201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021612541) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 25555 + ... + 51925.

It is an arithmetic number, because the mean of its divisors is an integer number (48458550).

Almost surely, 2^1021612540 is an apocalyptic number.

1021612540 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 1021612540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1163005200).

1021612540 is an abundant number, since it is smaller than the sum of its proper divisors (1304397860).

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

1021612540 is a wasteful number, since it uses less digits than its factorization.

1021612540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26542 (or 26540 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 1021612540 is about 31962.6741684735. The cubic root of 1021612540 is about 1007.1528941158.

Adding to 1021612540 its reverse (452161201), we get a palindrome (1473773741).

The spelling of 1021612540 in words is "one billion, twenty-one million, six hundred twelve thousand, five hundred forty".