125261820 has 36 divisors (see below), whose sum is σ = 379961400. Its totient is φ = 33403104.

The previous prime is 125261809. The next prime is 125261839. The reversal of 125261820 is 28162521.

It is a happy number.

125261820 is a `hidden beast` number, since 1 + 25 + 2 + 618 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 347770 + ... + 348129.

Almost surely, 2^125261820 is an apocalyptic number.

125261820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

125261820 is an abundant number, since it is smaller than the sum of its proper divisors (254699580).

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

125261820 is a wasteful number, since it uses less digits than its factorization.

125261820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695914 (or 695909 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 125261820 is about 11192.0427089964. The cubic root of 125261820 is about 500.3488498842.

The spelling of 125261820 in words is "one hundred twenty-five million, two hundred sixty-one thousand, eight hundred twenty".