12621953 has 4 divisors (see below), whose sum is σ = 12629760. Its totient is φ = 12614148.

The previous prime is 12621949. The next prime is 12621967. The reversal of 12621953 is 35912621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12621953 - 2² = 12621949 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12621923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 473 + ... + 5046.

It is an arithmetic number, because the mean of its divisors is an integer number (3157440).

Almost surely, 2^12621953 is an apocalyptic number.

It is an amenable number.

12621953 is a deficient number, since it is larger than the sum of its proper divisors (7807).

12621953 is an equidigital number, since it uses as much as digits as its factorization.

12621953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7806.

The product of its digits is 3240, while the sum is 29.

The square root of 12621953 is about 3552.7388026704. The cubic root of 12621953 is about 232.8317413312.

The spelling of 12621953 in words is "twelve million, six hundred twenty-one thousand, nine hundred fifty-three".