998923839 has 4 divisors (see below), whose sum is σ = 1331898456. Its totient is φ = 665949224.

The previous prime is 998923831. The next prime is 998923847. The reversal of 998923839 is 938329899.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (998923831) and next prime (998923847).

It is a cyclic number.

It is not a de Polignac number, because 998923839 - 2³ = 998923831 is a prime.

It is a super-2 number, since 2×998923839² = 1995697672244995842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998923831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166487304 + ... + 166487309.

It is an arithmetic number, because the mean of its divisors is an integer number (332974614).

Almost surely, 2^998923839 is an apocalyptic number.

998923839 is a deficient number, since it is larger than the sum of its proper divisors (332974617).

998923839 is a wasteful number, since it uses less digits than its factorization.

998923839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332974616.

The product of its digits is 7558272, while the sum is 60.

The square root of 998923839 is about 31605.7564218925. The cubic root of 998923839 is about 999.6411509094.

The spelling of 998923839 in words is "nine hundred ninety-eight million, nine hundred twenty-three thousand, eight hundred thirty-nine".