998764839 has 12 divisors (see below), whose sum is σ = 1443453336. Its totient is φ = 665477232.

The previous prime is 998764831. The next prime is 998764867. The reversal of 998764839 is 938467899.

It is not a de Polignac number, because 998764839 - 2³ = 998764831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998764831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12669 + ... + 46454.

It is an arithmetic number, because the mean of its divisors is an integer number (120287778).

Almost surely, 2^998764839 is an apocalyptic number.

998764839 is the 16893-rd nonagonal number.

998764839 is a deficient number, since it is larger than the sum of its proper divisors (444688497).

998764839 is a wasteful number, since it uses less digits than its factorization.

998764839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61006 (or 61003 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 63.

The square root of 998764839 is about 31603.2409572183. The cubic root of 998764839 is about 999.5881100366.

The spelling of 998764839 in words is "nine hundred ninety-eight million, seven hundred sixty-four thousand, eight hundred thirty-nine".