997979799 has 32 divisors (see below), whose sum is σ = 1394265600. Its totient is φ = 634372992.

The previous prime is 997979767. The next prime is 997979803.

997979799 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 997979799 - 2⁵ = 997979767 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 997979799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997979299) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1372374 + ... + 1373100.

It is an arithmetic number, because the mean of its divisors is an integer number (43570800).

Almost surely, 2^997979799 is an apocalyptic number.

997979799 is a deficient number, since it is larger than the sum of its proper divisors (396285801).

997979799 is a wasteful number, since it uses less digits than its factorization.

997979799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999.

The product of its digits is 182284263, while the sum is 75.

The square root of 997979799 is about 31590.8182705039. The cubic root of 997979799 is about 999.3261456890.

The spelling of 997979799 in words is "nine hundred ninety-seven million, nine hundred seventy-nine thousand, seven hundred ninety-nine".