12139942 has 4 divisors (see below), whose sum is σ = 18209916. Its totient is φ = 6069970.

The previous prime is 12139913. The next prime is 12139943. The reversal of 12139942 is 24993121.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12139943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3034984 + ... + 3034987.

It is an arithmetic number, because the mean of its divisors is an integer number (4552479).

Almost surely, 2^12139942 is an apocalyptic number.

12139942 is a deficient number, since it is larger than the sum of its proper divisors (6069974).

12139942 is an equidigital number, since it uses as much as digits as its factorization.

12139942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6069973.

The product of its digits is 3888, while the sum is 31.

The square root of 12139942 is about 3484.2419548590. The cubic root of 12139942 is about 229.8293756599.

The spelling of 12139942 in words is "twelve million, one hundred thirty-nine thousand, nine hundred forty-two".