12977921 has 8 divisors (see below), whose sum is σ = 14304864. Its totient is φ = 11675520.

The previous prime is 12977879. The next prime is 12977927.

12977921 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12977921 - 2⁶ = 12977857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12977927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5015 + ... + 7148.

It is an arithmetic number, because the mean of its divisors is an integer number (1788108).

Almost surely, 2^12977921 is an apocalyptic number.

12977921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12977921 is a deficient number, since it is larger than the sum of its proper divisors (1326943).

12977921 is a wasteful number, since it uses less digits than its factorization.

12977921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12271.

The product of its digits is 15876, while the sum is 38.

The square root of 12977921 is about 3602.4881679195. The cubic root of 12977921 is about 235.0002776517. Note that the first 3 decimals are identical.

The spelling of 12977921 in words is "twelve million, nine hundred seventy-seven thousand, nine hundred twenty-one".