998392879 has 8 divisors (see below), whose sum is σ = 1091244672. Its totient is φ = 905889240.

The previous prime is 998392873. The next prime is 998392883. The reversal of 998392879 is 978293899.

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 998392879 - 2¹⁷ = 998261807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 998392879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998392873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81019 + ... + 92524.

It is an arithmetic number, because the mean of its divisors is an integer number (136405584).

Almost surely, 2^998392879 is an apocalyptic number.

998392879 is a deficient number, since it is larger than the sum of its proper divisors (92851793).

998392879 is a wasteful number, since it uses less digits than its factorization.

998392879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174077.

The product of its digits is 17635968, while the sum is 64.

The square root of 998392879 is about 31597.3555697308. The cubic root of 998392879 is about 999.4640057615.

The spelling of 998392879 in words is "nine hundred ninety-eight million, three hundred ninety-two thousand, eight hundred seventy-nine".