12125639 has 4 divisors (see below), whose sum is σ = 12193560. Its totient is φ = 12057720.

The previous prime is 12125609. The next prime is 12125647. The reversal of 12125639 is 93652121.

12125639 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 12125639 - 2²⁰ = 11077063 is a prime.

It is a super-2 number, since 2×12125639² = 294062242316642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12125609) 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, 33692 + ... + 34049.

It is an arithmetic number, because the mean of its divisors is an integer number (3048390).

Almost surely, 2^12125639 is an apocalyptic number.

12125639 is a deficient number, since it is larger than the sum of its proper divisors (67921).

12125639 is an equidigital number, since it uses as much as digits as its factorization.

12125639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67920.

The product of its digits is 3240, while the sum is 29.

The square root of 12125639 is about 3482.1888231398. The cubic root of 12125639 is about 229.7390802974.

The spelling of 12125639 in words is "twelve million, one hundred twenty-five thousand, six hundred thirty-nine".