398042820 has 72 divisors (see below), whose sum is σ = 1379886144. Its totient is φ = 90980928.

The previous prime is 398042809. The next prime is 398042831. The reversal of 398042820 is 28240893.

It is an interprime number because it is at equal distance from previous prime (398042809) and next prime (398042831).

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 156694 + ... + 159213.

Almost surely, 2^398042820 is an apocalyptic number.

398042820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

398042820 is an abundant number, since it is smaller than the sum of its proper divisors (981843324).

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

398042820 is a wasteful number, since it uses less digits than its factorization.

398042820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315929 (or 315924 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 398042820 is about 19951.0105007240. The cubic root of 398042820 is about 735.6026156047.

It can be divided in two parts, 39804 and 2820, that added together give a palindrome (42624).

The spelling of 398042820 in words is "three hundred ninety-eight million, forty-two thousand, eight hundred twenty".