125656638 has 16 divisors (see below), whose sum is σ = 251496576. Its totient is φ = 41855000.

The previous prime is 125656637. The next prime is 125656649. The reversal of 125656638 is 836656521.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 125656638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125656631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2263 + ... + 16013.

It is an arithmetic number, because the mean of its divisors is an integer number (15718536).

Almost surely, 2^125656638 is an apocalyptic number.

125656638 is an abundant number, since it is smaller than the sum of its proper divisors (125839938).

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

125656638 is a wasteful number, since it uses less digits than its factorization.

125656638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15279.

The product of its digits is 259200, while the sum is 42.

The square root of 125656638 is about 11209.6671672267. The cubic root of 125656638 is about 500.8739887306.

The spelling of 125656638 in words is "one hundred twenty-five million, six hundred fifty-six thousand, six hundred thirty-eight".