397704780 has 72 divisors (see below), whose sum is σ = 1316047824. Its totient is φ = 96412800.

The previous prime is 397704779. The next prime is 397704793. The reversal of 397704780 is 87407793.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 98451 + ... + 102410.

It is an arithmetic number, because the mean of its divisors is an integer number (18278442).

Almost surely, 2^397704780 is an apocalyptic number.

397704780 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

397704780 is an abundant number, since it is smaller than the sum of its proper divisors (918343044).

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

397704780 is a wasteful number, since it uses less digits than its factorization.

397704780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200887 (or 200882 counting only the distinct ones).

The product of its (nonzero) digits is 296352, while the sum is 45.

The square root of 397704780 is about 19942.5369499470. The cubic root of 397704780 is about 735.3943184721.

The spelling of 397704780 in words is "three hundred ninety-seven million, seven hundred four thousand, seven hundred eighty".