12621987 has 40 divisors (see below), whose sum is σ = 21849696. Its totient is φ = 7112448.

The previous prime is 12621979. The next prime is 12621997. The reversal of 12621987 is 78912621.

It is not a de Polignac number, because 12621987 - 2³ = 12621979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12621967) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 63973 + ... + 64169.

Almost surely, 2^12621987 is an apocalyptic number.

12621987 is a deficient number, since it is larger than the sum of its proper divisors (9227709).

12621987 is a wasteful number, since it uses less digits than its factorization.

12621987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329 (or 320 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 12621987 is about 3552.7435877080. The cubic root of 12621987 is about 232.8319503921.

It can be divided in two parts, 1262 and 1987, that added together give a square (3249 = 57²).

The spelling of 12621987 in words is "twelve million, six hundred twenty-one thousand, nine hundred eighty-seven".