398407818 has 32 divisors (see below), whose sum is σ = 848439360. Its totient is φ = 124286720.

The previous prime is 398407799. The next prime is 398407831. The reversal of 398407818 is 818704893.

It is a super-2 number, since 2×398407818² = 317457578887042248, which contains 22 as substring.

It is an unprimeable number.

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, 7348 + ... + 29168.

It is an arithmetic number, because the mean of its divisors is an integer number (26513730).

Almost surely, 2^398407818 is an apocalyptic number.

398407818 is an abundant number, since it is smaller than the sum of its proper divisors (450031542).

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

398407818 is a wasteful number, since it uses less digits than its factorization.

398407818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22022.

The product of its (nonzero) digits is 387072, while the sum is 48.

The square root of 398407818 is about 19960.1557609153. The cubic root of 398407818 is about 735.8273916371.

The spelling of 398407818 in words is "three hundred ninety-eight million, four hundred seven thousand, eight hundred eighteen".