125721988 has 48 divisors (see below), whose sum is σ = 261065728. Its totient is φ = 51840000.

The previous prime is 125721971. The next prime is 125721997. The reversal of 125721988 is 889127521.

It is a happy number.

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, 208888 + ... + 209488.

Almost surely, 2^125721988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 125721988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130532864).

125721988 is an abundant number, since it is smaller than the sum of its proper divisors (135343740).

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

125721988 is a wasteful number, since it uses less digits than its factorization.

125721988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884 (or 882 counting only the distinct ones).

The product of its digits is 80640, while the sum is 43.

The square root of 125721988 is about 11212.5816830915. The cubic root of 125721988 is about 500.9608031985.

The spelling of 125721988 in words is "one hundred twenty-five million, seven hundred twenty-one thousand, nine hundred eighty-eight".