397839420 has 72 divisors (see below), whose sum is σ = 1316493360. Its totient is φ = 96445440.

The previous prime is 397839401. The next prime is 397839437. The reversal of 397839420 is 24938793.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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, 98485 + ... + 102444.

It is an arithmetic number, because the mean of its divisors is an integer number (18284630).

Almost surely, 2^397839420 is an apocalyptic number.

397839420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

397839420 is an abundant number, since it is smaller than the sum of its proper divisors (918653940).

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

397839420 is a wasteful number, since it uses less digits than its factorization.

397839420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200955 (or 200950 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 397839420 is about 19945.9123631886. The cubic root of 397839420 is about 735.4772965375.

The spelling of 397839420 in words is "three hundred ninety-seven million, eight hundred thirty-nine thousand, four hundred twenty".