125900639 has 4 divisors (see below), whose sum is σ = 128579424. Its totient is φ = 123221856.

The previous prime is 125900633. The next prime is 125900647. The reversal of 125900639 is 936009521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125900639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 125900599 and 125900608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125900633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1339322 + ... + 1339415.

It is an arithmetic number, because the mean of its divisors is an integer number (32144856).

Almost surely, 2^125900639 is an apocalyptic number.

125900639 is a deficient number, since it is larger than the sum of its proper divisors (2678785).

125900639 is an equidigital number, since it uses as much as digits as its factorization.

125900639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2678784.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 125900639 is about 11220.5453967265. The cubic root of 125900639 is about 501.1979793983.

The spelling of 125900639 in words is "one hundred twenty-five million, nine hundred thousand, six hundred thirty-nine".