397720008 has 192 divisors, whose sum is σ = 1328745600. Its totient is φ = 104924160.

The previous prime is 397719991. The next prime is 397720009. The reversal of 397720008 is 800027793.

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

It is not an unprimeable number, because it can be changed into a prime (397720009) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 392110 + ... + 393122.

It is an arithmetic number, because the mean of its divisors is an integer number (6920550).

Almost surely, 2^397720008 is an apocalyptic number.

397720008 is a gapful number since it is divisible by the number (38) 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 397720008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (664372800).

397720008 is an abundant number, since it is smaller than the sum of its proper divisors (931025592).

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

397720008 is a wasteful number, since it uses less digits than its factorization.

397720008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092 (or 1085 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 397720008 is about 19942.9187432532. The cubic root of 397720008 is about 735.4037043636.

The spelling of 397720008 in words is "three hundred ninety-seven million, seven hundred twenty thousand, eight".