977989979 has 8 divisors (see below), whose sum is σ = 1014445872. Its totient is φ = 942157440.

The previous prime is 977989963. The next prime is 977989993. The reversal of 977989979 is 979989779.

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 977989979 - 2⁴ = 977989963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (977989919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152642 + ... + 158919.

It is an arithmetic number, because the mean of its divisors is an integer number (126805734).

Almost surely, 2^977989979 is an apocalyptic number.

977989979 is a deficient number, since it is larger than the sum of its proper divisors (36455893).

977989979 is a wasteful number, since it uses less digits than its factorization.

977989979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311677.

The product of its digits is 162030456, while the sum is 74.

The square root of 977989979 is about 31272.8313236905. The cubic root of 977989979 is about 992.6088315540.

The spelling of 977989979 in words is "nine hundred seventy-seven million, nine hundred eighty-nine thousand, nine hundred seventy-nine".