397867680 has 384 divisors, whose sum is σ = 1625702400. Its totient is φ = 88998912.

The previous prime is 397867663. The next prime is 397867699. The reversal of 397867680 is 86768793.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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 63 ways as a sum of consecutive naturals, for example, 1784049 + ... + 1784271.

It is an arithmetic number, because the mean of its divisors is an integer number (4233600).

Almost surely, 2^397867680 is an apocalyptic number.

397867680 is a gapful number since it is divisible by the number (30) 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 397867680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (812851200).

397867680 is an abundant number, since it is smaller than the sum of its proper divisors (1227834720).

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

397867680 is a wasteful number, since it uses less digits than its factorization.

397867680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313 (or 299 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The square root of 397867680 is about 19946.6207664356. The cubic root of 397867680 is about 735.4947106793.

The spelling of 397867680 in words is "three hundred ninety-seven million, eight hundred sixty-seven thousand, six hundred eighty".