522172440 has 128 divisors (see below), whose sum is σ = 1832256000. Its totient is φ = 131912064.

The previous prime is 522172439. The next prime is 522172451. The reversal of 522172440 is 44271225.

522172440 is a `hidden beast` number, since 5 + 2 + 217 + 2 + 440 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7797 + ... + 33243.

It is an arithmetic number, because the mean of its divisors is an integer number (14314500).

Almost surely, 2^522172440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 522172440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (916128000).

522172440 is an abundant number, since it is smaller than the sum of its proper divisors (1310083560).

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

522172440 is a wasteful number, since it uses less digits than its factorization.

522172440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25486 (or 25476 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 27.

The square root of 522172440 is about 22851.0927528641. The cubic root of 522172440 is about 805.2634401343.

The spelling of 522172440 in words is "five hundred twenty-two million, one hundred seventy-two thousand, four hundred forty".