12638690 has 16 divisors (see below), whose sum is σ = 22790592. Its totient is φ = 5046384.

The previous prime is 12638683. The next prime is 12638699. The reversal of 12638690 is 9683621.

It is a super-2 number, since 2×12638690² = 319472969832200, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12638690.

It is not an unprimeable number, because it can be changed into a prime (12638699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9017 + ... + 10323.

It is an arithmetic number, because the mean of its divisors is an integer number (1424412).

Almost surely, 2^12638690 is an apocalyptic number.

12638690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12638690 is a deficient number, since it is larger than the sum of its proper divisors (10151902).

12638690 is a wasteful number, since it uses less digits than its factorization.

12638690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2281.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 12638690 is about 3555.0935290088. The cubic root of 12638690 is about 232.9346092910.

The spelling of 12638690 in words is "twelve million, six hundred thirty-eight thousand, six hundred ninety".