12621986 has 16 divisors (see below), whose sum is σ = 21276864. Its totient is φ = 5571984.

The previous prime is 12621979. The next prime is 12621997. The reversal of 12621986 is 68912621.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9956 + ... + 11151.

It is an arithmetic number, because the mean of its divisors is an integer number (1329804).

Almost surely, 2^12621986 is an apocalyptic number.

12621986 is a deficient number, since it is larger than the sum of its proper divisors (8654878).

12621986 is a wasteful number, since it uses less digits than its factorization.

12621986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21145.

The product of its digits is 10368, while the sum is 35.

The square root of 12621986 is about 3552.7434469716. The cubic root of 12621986 is about 232.8319442433.

The spelling of 12621986 in words is "twelve million, six hundred twenty-one thousand, nine hundred eighty-six".