398409318 has 24 divisors (see below), whose sum is σ = 881588448. Its totient is φ = 129977232.

The previous prime is 398409313. The next prime is 398409373. The reversal of 398409318 is 813904893.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398409313) 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, 234621 + ... + 236312.

It is an arithmetic number, because the mean of its divisors is an integer number (36732852).

Almost surely, 2^398409318 is an apocalyptic number.

398409318 is an abundant number, since it is smaller than the sum of its proper divisors (483179130).

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

398409318 is a wasteful number, since it uses less digits than its factorization.

398409318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470988 (or 470985 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 398409318 is about 19960.1933357370. The cubic root of 398409318 is about 735.8283150960.

The spelling of 398409318 in words is "three hundred ninety-eight million, four hundred nine thousand, three hundred eighteen".