12139831 has 4 divisors (see below), whose sum is σ = 13243464. Its totient is φ = 11036200.

The previous prime is 12139823. The next prime is 12139847. The reversal of 12139831 is 13893121.

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 12139831 - 2³ = 12139823 is a prime.

It is a super-2 number, since 2×12139831² = 294750993417122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12139831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12139861) 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, 551800 + ... + 551821.

It is an arithmetic number, because the mean of its divisors is an integer number (3310866).

Almost surely, 2^12139831 is an apocalyptic number.

12139831 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12139831 is a deficient number, since it is larger than the sum of its proper divisors (1103633).

12139831 is a wasteful number, since it uses less digits than its factorization.

12139831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103632.

The product of its digits is 1296, while the sum is 28.

The square root of 12139831 is about 3484.2260259633. The cubic root of 12139831 is about 229.8286751860.

The spelling of 12139831 in words is "twelve million, one hundred thirty-nine thousand, eight hundred thirty-one".