125981865 has 16 divisors (see below), whose sum is σ = 223968000. Its totient is φ = 67190256.

The previous prime is 125981857. The next prime is 125981893. The reversal of 125981865 is 568189521.

It is a happy number.

It is not a de Polignac number, because 125981865 - 2³ = 125981857 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 125981865.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 466465 + ... + 466734.

It is an arithmetic number, because the mean of its divisors is an integer number (13998000).

Almost surely, 2^125981865 is an apocalyptic number.

125981865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

125981865 is a deficient number, since it is larger than the sum of its proper divisors (97986135).

125981865 is an equidigital number, since it uses as much as digits as its factorization.

125981865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933213 (or 933207 counting only the distinct ones).

The product of its digits is 172800, while the sum is 45.

The square root of 125981865 is about 11224.1643341498. The cubic root of 125981865 is about 501.3057404488.

The spelling of 125981865 in words is "one hundred twenty-five million, nine hundred eighty-one thousand, eight hundred sixty-five".