12139813 has 8 divisors (see below), whose sum is σ = 14212800. Its totient is φ = 10151520.

The previous prime is 12139807. The next prime is 12139823. The reversal of 12139813 is 31893121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12139813 - 2¹³ = 12131621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12139823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20863 + ... + 21436.

It is an arithmetic number, because the mean of its divisors is an integer number (1776600).

Almost surely, 2^12139813 is an apocalyptic number.

It is an amenable number.

12139813 is a deficient number, since it is larger than the sum of its proper divisors (2072987).

12139813 is an equidigital number, since it uses as much as digits as its factorization.

12139813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42347.

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

The square root of 12139813 is about 3484.2234428923. The cubic root of 12139813 is about 229.8285615952.

It can be divided in two parts, 1213 and 9813, that added together give a triangular number (11026 = T₁₄₈).

The spelling of 12139813 in words is "twelve million, one hundred thirty-nine thousand, eight hundred thirteen".