398920863 has 16 divisors (see below), whose sum is σ = 583203456. Its totient is φ = 240539040.

The previous prime is 398920859. The next prime is 398920871. The reversal of 398920863 is 368029893.

It is not a de Polignac number, because 398920863 - 2² = 398920859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398920853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24181 + ... + 37182.

It is an arithmetic number, because the mean of its divisors is an integer number (36450216).

Almost surely, 2^398920863 is an apocalyptic number.

398920863 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

398920863 is a deficient number, since it is larger than the sum of its proper divisors (184282593).

398920863 is a wasteful number, since it uses less digits than its factorization.

398920863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61574.

The product of its (nonzero) digits is 559872, while the sum is 48.

The square root of 398920863 is about 19973.0033545283. The cubic root of 398920863 is about 736.1431071905.

The spelling of 398920863 in words is "three hundred ninety-eight million, nine hundred twenty thousand, eight hundred sixty-three".