12621917 has 16 divisors (see below), whose sum is σ = 16422912. Its totient is φ = 9406320.

The previous prime is 12621911. The next prime is 12621923. The reversal of 12621917 is 71912621.

It is an interprime number because it is at equal distance from previous prime (12621911) and next prime (12621923).

It is not a de Polignac number, because 12621917 - 2⁴ = 12621901 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12621917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12621911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1793 + ... + 5334.

It is an arithmetic number, because the mean of its divisors is an integer number (1026432).

Almost surely, 2^12621917 is an apocalyptic number.

It is an amenable number.

12621917 is a deficient number, since it is larger than the sum of its proper divisors (3800995).

12621917 is a wasteful number, since it uses less digits than its factorization.

12621917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7168.

The product of its digits is 1512, while the sum is 29.

The square root of 12621917 is about 3552.7337361530. The cubic root of 12621917 is about 232.8315199721.

The spelling of 12621917 in words is "twelve million, six hundred twenty-one thousand, nine hundred seventeen".