12139690 has 32 divisors (see below), whose sum is σ = 23178960. Its totient is φ = 4569600.

The previous prime is 12139679. The next prime is 12139691. The reversal of 12139690 is 9693121.

It can be written as a sum of positive squares in 8 ways, for example, as 2647129 + 9492561 = 1627^2 + 3081^2 .

It is a super-2 number, since 2×12139690² = 294744146592200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12139691) 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 15 ways as a sum of consecutive naturals, for example, 11380 + ... + 12400.

Almost surely, 2^12139690 is an apocalyptic number.

12139690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12139690 is a deficient number, since it is larger than the sum of its proper divisors (11039270).

12139690 is a wasteful number, since it uses less digits than its factorization.

12139690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 12139690 is about 3484.2057918556. The cubic root of 12139690 is about 229.8277853886.

The spelling of 12139690 in words is "twelve million, one hundred thirty-nine thousand, six hundred ninety".