125903556 has 18 divisors (see below), whose sum is σ = 318256302. Its totient is φ = 41967840.

The previous prime is 125903551. The next prime is 125903597. The reversal of 125903556 is 655309521.

125903556 is a `hidden beast` number, since 12 + 5 + 90 + 3 + 556 = 666.

It can be written as a sum of positive squares in only one way, i.e., 85377600 + 40525956 = 9240^2 + 6366^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 3497321 = 125903556 / (1 + 2 + 5 + 9 + 0 + 3 + 5 + 5 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 125903556.

It is not an unprimeable number, because it can be changed into a prime (125903551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1748625 + ... + 1748696.

Almost surely, 2^125903556 is an apocalyptic number.

It is an amenable number.

125903556 is an abundant number, since it is smaller than the sum of its proper divisors (192352746).

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

125903556 is a wasteful number, since it uses less digits than its factorization.

125903556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3497331 (or 3497326 counting only the distinct ones).

The product of its (nonzero) digits is 40500, while the sum is 36.

The square root of 125903556 is about 11220.6753807425. The cubic root of 125903556 is about 501.2018501312.

The spelling of 125903556 in words is "one hundred twenty-five million, nine hundred three thousand, five hundred fifty-six".