525638 has 4 divisors (see below), whose sum is σ = 788460. Its totient is φ = 262818.

The previous prime is 525607. The next prime is 525641. The reversal of 525638 is 836525.

It is a semiprime because it is the product of two primes.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 525638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131408 + ... + 131411.

It is an arithmetic number, because the mean of its divisors is an integer number (197115).

2⁵²⁵⁶³⁸ is an apocalyptic number.

525638 is a deficient number, since it is larger than the sum of its proper divisors (262822).

525638 is a wasteful number, since it uses less digits than its factorization.

525638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262821.

The product of its digits is 7200, while the sum is 29.

The square root of 525638 is about 725.0089654618. The cubic root of 525638 is about 80.7040974054.

The spelling of 525638 in words is "five hundred twenty-five thousand, six hundred thirty-eight".