398438810 has 64 divisors (see below), whose sum is σ = 896728320. Its totient is φ = 123832320.

The previous prime is 398438773. The next prime is 398438851. The reversal of 398438810 is 18834893.

It is a super-2 number, since 2×398438810² = 317506970628432200, which contains 22 as substring.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 428426 + ... + 429354.

It is an arithmetic number, because the mean of its divisors is an integer number (14011380).

Almost surely, 2^398438810 is an apocalyptic number.

398438810 is an abundant number, since it is smaller than the sum of its proper divisors (498289510).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

398438810 is a wasteful number, since it uses less digits than its factorization.

398438810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 398438810 is about 19960.9320924650. The cubic root of 398438810 is about 735.8464710579.

The spelling of 398438810 in words is "three hundred ninety-eight million, four hundred thirty-eight thousand, eight hundred ten".