125638 has 4 divisors (see below), whose sum is σ = 188460. Its totient is φ = 62818.

The previous prime is 125627. The next prime is 125639. The reversal of 125638 is 836521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 836521 = 7 ⋅119503.

It is an Ulam number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31408 + ... + 31411.

It is an arithmetic number, because the mean of its divisors is an integer number (47115).

2¹²⁵⁶³⁸ is an apocalyptic number.

125638 is a deficient number, since it is larger than the sum of its proper divisors (62822).

125638 is an equidigital number, since it uses as much as digits as its factorization.

125638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62821.

The product of its digits is 1440, while the sum is 25.

The square root of 125638 is about 354.4545104805. The cubic root of 125638 is about 50.0849223489.

The spelling of 125638 in words is "one hundred twenty-five thousand, six hundred thirty-eight".