125865399 has 16 divisors (see below), whose sum is σ = 193847040. Its totient is φ = 71794560.

The previous prime is 125865353. The next prime is 125865401. The reversal of 125865399 is 993568521.

It is a happy number.

It is not a de Polignac number, because 125865399 - 2¹⁵ = 125832631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125865799) 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, 111619 + ... + 112740.

It is an arithmetic number, because the mean of its divisors is an integer number (12115440).

Almost surely, 2^125865399 is an apocalyptic number.

125865399 is a deficient number, since it is larger than the sum of its proper divisors (67981641).

125865399 is a wasteful number, since it uses less digits than its factorization.

125865399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224390.

The product of its digits is 583200, while the sum is 48.

The square root of 125865399 is about 11218.9749531764. The cubic root of 125865399 is about 501.1512127176.

The spelling of 125865399 in words is "one hundred twenty-five million, eight hundred sixty-five thousand, three hundred ninety-nine".