979998919 has 4 divisors (see below), whose sum is σ = 985867344. Its totient is φ = 974130496.

The previous prime is 979998917. The next prime is 979998923. The reversal of 979998919 is 919899979.

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 979998919 - 2¹ = 979998917 is a prime.

It is a super-2 number, since 2×979998919² = 1920795762482337122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (979998917) 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, 2933962 + ... + 2934295.

It is an arithmetic number, because the mean of its divisors is an integer number (246466836).

Almost surely, 2^979998919 is an apocalyptic number.

979998919 is a deficient number, since it is larger than the sum of its proper divisors (5868425).

979998919 is a wasteful number, since it uses less digits than its factorization.

979998919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5868424.

The product of its digits is 29760696, while the sum is 70.

The square root of 979998919 is about 31304.9344193531. The cubic root of 979998919 is about 993.2880231598.

The spelling of 979998919 in words is "nine hundred seventy-nine million, nine hundred ninety-eight thousand, nine hundred nineteen".