125539399 has 4 divisors (see below), whose sum is σ = 126092664. Its totient is φ = 124986136.

The previous prime is 125539369. The next prime is 125539423. The reversal of 125539399 is 993935521.

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-125539399 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 (125539319) 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, 276292 + ... + 276745.

It is an arithmetic number, because the mean of its divisors is an integer number (31523166).

Almost surely, 2^125539399 is an apocalyptic number.

125539399 is a deficient number, since it is larger than the sum of its proper divisors (553265).

125539399 is an equidigital number, since it uses as much as digits as its factorization.

125539399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553264.

The product of its digits is 328050, while the sum is 46.

The square root of 125539399 is about 11204.4365766423. The cubic root of 125539399 is about 500.7181666461.

It can be divided in two parts, 12553 and 9399, that added together give a cube (21952 = 28³).

The spelling of 125539399 in words is "one hundred twenty-five million, five hundred thirty-nine thousand, three hundred ninety-nine".