399319998 has 64 divisors (see below), whose sum is σ = 1048135680. Its totient is φ = 98258400.

The previous prime is 399319993. The next prime is 399320003. The reversal of 399319998 is 899913993.

It is an interprime number because it is at equal distance from previous prime (399319993) and next prime (399320003).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399319993) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13968 + ... + 31523.

It is an arithmetic number, because the mean of its divisors is an integer number (16377120).

Almost surely, 2^399319998 is an apocalyptic number.

399319998 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

399319998 is an abundant number, since it is smaller than the sum of its proper divisors (648815682).

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

399319998 is a wasteful number, since it uses less digits than its factorization.

399319998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45533.

The product of its digits is 4251528, while the sum is 60.

The square root of 399319998 is about 19982.9927188097. The cubic root of 399319998 is about 736.3885381084.

The spelling of 399319998 in words is "three hundred ninety-nine million, three hundred nineteen thousand, nine hundred ninety-eight".