125139989 has 8 divisors (see below), whose sum is σ = 134877792. Its totient is φ = 115418160.

The previous prime is 125139983. The next prime is 125140021. The reversal of 125139989 is 989931521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 125139989 - 2²⁴ = 108362773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125139983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16034 + ... + 22524.

It is an arithmetic number, because the mean of its divisors is an integer number (16859724).

Almost surely, 2^125139989 is an apocalyptic number.

It is an amenable number.

125139989 is a deficient number, since it is larger than the sum of its proper divisors (9737803).

125139989 is a wasteful number, since it uses less digits than its factorization.

125139989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7987.

The product of its digits is 174960, while the sum is 47.

The square root of 125139989 is about 11186.5986340800. The cubic root of 125139989 is about 500.1865823654.

The spelling of 125139989 in words is "one hundred twenty-five million, one hundred thirty-nine thousand, nine hundred eighty-nine".