525694440 has 128 divisors (see below), whose sum is σ = 1667174400. Its totient is φ = 132337920.

The previous prime is 525694399. The next prime is 525694441. The reversal of 525694440 is 44496525.

It is a happy number.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (525694441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 216835 + ... + 219245.

It is an arithmetic number, because the mean of its divisors is an integer number (13024800).

Almost surely, 2^525694440 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 525694440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (833587200).

525694440 is an abundant number, since it is smaller than the sum of its proper divisors (1141479960).

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

525694440 is a wasteful number, since it uses less digits than its factorization.

525694440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2527 (or 2523 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 39.

The square root of 525694440 is about 22928.0273900744. The cubic root of 525694440 is about 807.0698581673.

The spelling of 525694440 in words is "five hundred twenty-five million, six hundred ninety-four thousand, four hundred forty".