397354820 has 12 divisors (see below), whose sum is σ = 834445164. Its totient is φ = 158941920.

The previous prime is 397354819. The next prime is 397354861. The reversal of 397354820 is 28453793.

It can be written as a sum of positive squares in 2 ways, for example, as 49308484 + 348046336 = 7022^2 + 18656^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9933851 + ... + 9933890.

It is an arithmetic number, because the mean of its divisors is an integer number (69537097).

Almost surely, 2^397354820 is an apocalyptic number.

It is an amenable number.

397354820 is an abundant number, since it is smaller than the sum of its proper divisors (437090344).

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

397354820 is a wasteful number, since it uses less digits than its factorization.

397354820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19867750 (or 19867748 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 397354820 is about 19933.7608092402. The cubic root of 397354820 is about 735.1785519596.

The spelling of 397354820 in words is "three hundred ninety-seven million, three hundred fifty-four thousand, eight hundred twenty".