12977621 has 4 divisors (see below), whose sum is σ = 13004544. Its totient is φ = 12950700.

The previous prime is 12977617. The next prime is 12977651. The reversal of 12977621 is 12677921.

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.

It is a cyclic number.

It is not a de Polignac number, because 12977621 - 2² = 12977617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12977651) 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 3 ways as a sum of consecutive naturals, for example, 12725 + ... + 13706.

It is an arithmetic number, because the mean of its divisors is an integer number (3251136).

Almost surely, 2^12977621 is an apocalyptic number.

It is an amenable number.

12977621 is a deficient number, since it is larger than the sum of its proper divisors (26923).

12977621 is an equidigital number, since it uses as much as digits as its factorization.

12977621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26922.

The product of its digits is 10584, while the sum is 35.

The square root of 12977621 is about 3602.4465297906. The cubic root of 12977621 is about 234.9984668679.

The spelling of 12977621 in words is "twelve million, nine hundred seventy-seven thousand, six hundred twenty-one".