521540032 has 112 divisors (see below), whose sum is σ = 1170464512. Its totient is φ = 228925440.

The previous prime is 521540029. The next prime is 521540051. The reversal of 521540032 is 230045125.

It is a super-2 number, since 2×521540032² = 544008009957122048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 521539985 and 521540012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1882678 + ... + 1882954.

It is an arithmetic number, because the mean of its divisors is an integer number (10450576).

Almost surely, 2^521540032 is an apocalyptic number.

521540032 is a gapful number since it is divisible by the number (52) 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 521540032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (585232256).

521540032 is an abundant number, since it is smaller than the sum of its proper divisors (648924480).

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

521540032 is a wasteful number, since it uses less digits than its factorization.

521540032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406 (or 396 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 521540032 is about 22837.2509729170. The cubic root of 521540032 is about 804.9382214077.

Adding to 521540032 its reverse (230045125), we get a palindrome (751585157).

The spelling of 521540032 in words is "five hundred twenty-one million, five hundred forty thousand, thirty-two".