398831040 has 336 divisors, whose sum is σ = 1491130368. Its totient is φ = 101274624.

The previous prime is 398831021. The next prime is 398831057. The reversal of 398831040 is 40138893.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 398830986 and 398831004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1788369 + ... + 1788591.

It is an arithmetic number, because the mean of its divisors is an integer number (4437888).

Almost surely, 2^398831040 is an apocalyptic number.

398831040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 398831040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (745565184).

398831040 is an abundant number, since it is smaller than the sum of its proper divisors (1092299328).

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

398831040 is a wasteful number, since it uses less digits than its factorization.

398831040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278 (or 256 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 398831040 is about 19970.7546176903. The cubic root of 398831040 is about 736.0878518321.

The spelling of 398831040 in words is "three hundred ninety-eight million, eight hundred thirty-one thousand, forty".