12791977 has 4 divisors (see below), whose sum is σ = 13954896. Its totient is φ = 11629060.

The previous prime is 12791969. The next prime is 12791981. The reversal of 12791977 is 77919721.

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 12791977 - 2³ = 12791969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12791777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 581443 + ... + 581464.

It is an arithmetic number, because the mean of its divisors is an integer number (3488724).

Almost surely, 2^12791977 is an apocalyptic number.

It is an amenable number.

12791977 is a deficient number, since it is larger than the sum of its proper divisors (1162919).

12791977 is a wasteful number, since it uses less digits than its factorization.

12791977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162918.

The product of its digits is 55566, while the sum is 43.

The square root of 12791977 is about 3576.5873399094. The cubic root of 12791977 is about 233.8725351040.

The spelling of 12791977 in words is "twelve million, seven hundred ninety-one thousand, nine hundred seventy-seven".