977949779 has 4 divisors (see below), whose sum is σ = 1029420840. Its totient is φ = 926478720.

The previous prime is 977949757. The next prime is 977949793.

It is a happy number.

977949779 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 977949779 - 2²⁰ = 976901203 is a prime.

It is a super-2 number, since 2×977949779² = 1912771540492297682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (977949979) 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, 25735502 + ... + 25735539.

It is an arithmetic number, because the mean of its divisors is an integer number (257355210).

Almost surely, 2^977949779 is an apocalyptic number.

977949779 is a deficient number, since it is larger than the sum of its proper divisors (51471061).

977949779 is a wasteful number, since it uses less digits than its factorization.

977949779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51471060.

The product of its digits is 63011844, while the sum is 68.

The square root of 977949779 is about 31272.1885866659. The cubic root of 977949779 is about 992.5952310664.

The spelling of 977949779 in words is "nine hundred seventy-seven million, nine hundred forty-nine thousand, seven hundred seventy-nine".