521372742 has 16 divisors (see below), whose sum is σ = 1137540672. Its totient is φ = 157991720.

The previous prime is 521372729. The next prime is 521372743. The reversal of 521372742 is 247273125.

It is a super-2 number, since 2×521372742² = 543659072201197128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521372743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3949728 + ... + 3949859.

It is an arithmetic number, because the mean of its divisors is an integer number (71096292).

Almost surely, 2^521372742 is an apocalyptic number.

521372742 is an abundant number, since it is smaller than the sum of its proper divisors (616167930).

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

521372742 is a wasteful number, since it uses less digits than its factorization.

521372742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7899603.

The product of its digits is 23520, while the sum is 33.

The square root of 521372742 is about 22833.5880229105. The cubic root of 521372742 is about 804.8521477878.

The spelling of 521372742 in words is "five hundred twenty-one million, three hundred seventy-two thousand, seven hundred forty-two".