125991900 has 54 divisors (see below), whose sum is σ = 394917432. Its totient is φ = 33597600.

The previous prime is 125991889. The next prime is 125991923. The reversal of 125991900 is 9199521.

It is a super-2 number, since 2×125991900² = 31747917731220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 69096 + ... + 70895.

Almost surely, 2^125991900 is an apocalyptic number.

125991900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

125991900 is an abundant number, since it is smaller than the sum of its proper divisors (268925532).

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

125991900 is a wasteful number, since it uses less digits than its factorization.

125991900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140011 (or 140001 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 36.

The square root of 125991900 is about 11224.6113518464. The cubic root of 125991900 is about 501.3190504850.

The spelling of 125991900 in words is "one hundred twenty-five million, nine hundred ninety-one thousand, nine hundred".