125722639 has 16 divisors (see below), whose sum is σ = 156129280. Its totient is φ = 98794080.

The previous prime is 125722631. The next prime is 125722643. The reversal of 125722639 is 936227521.

It is not a de Polignac number, because 125722639 - 2³ = 125722631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 125722598 and 125722607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125722631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11124 + ... + 19369.

It is an arithmetic number, because the mean of its divisors is an integer number (9758080).

Almost surely, 2^125722639 is an apocalyptic number.

125722639 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

125722639 is a deficient number, since it is larger than the sum of its proper divisors (30406641).

125722639 is a wasteful number, since it uses less digits than its factorization.

125722639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30550.

The product of its digits is 45360, while the sum is 37.

The square root of 125722639 is about 11212.6107129428. The cubic root of 125722639 is about 500.9616678707.

The spelling of 125722639 in words is "one hundred twenty-five million, seven hundred twenty-two thousand, six hundred thirty-nine".