997279879 has 4 divisors (see below), whose sum is σ = 997591960. Its totient is φ = 996967800.

The previous prime is 997279873. The next prime is 997279897. The reversal of 997279879 is 978972799.

997279879 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 997279879 - 2¹³ = 997271687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997279873) 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, 151197 + ... + 157654.

It is an arithmetic number, because the mean of its divisors is an integer number (249397990).

Almost surely, 2^997279879 is an apocalyptic number.

997279879 is a deficient number, since it is larger than the sum of its proper divisors (312081).

997279879 is a wasteful number, since it uses less digits than its factorization.

997279879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312080.

The product of its digits is 36006768, while the sum is 67.

The square root of 997279879 is about 31579.7384251358. The cubic root of 997279879 is about 999.0924696378.

The spelling of 997279879 in words is "nine hundred ninety-seven million, two hundred seventy-nine thousand, eight hundred seventy-nine".