397679520 has 192 divisors, whose sum is σ = 1452681216. Its totient is φ = 89564160.

The previous prime is 397679461. The next prime is 397679539. The reversal of 397679520 is 25976793.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 397679520.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 237727 + ... + 239393.

It is an arithmetic number, because the mean of its divisors is an integer number (7566048).

Almost surely, 2^397679520 is an apocalyptic number.

397679520 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 397679520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (726340608).

397679520 is an abundant number, since it is smaller than the sum of its proper divisors (1055001696).

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

397679520 is a wasteful number, since it uses less digits than its factorization.

397679520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1763 (or 1755 counting only the distinct ones).

The product of its (nonzero) digits is 714420, while the sum is 48.

The square root of 397679520 is about 19941.9036202665. The cubic root of 397679520 is about 735.3787487541.

The spelling of 397679520 in words is "three hundred ninety-seven million, six hundred seventy-nine thousand, five hundred twenty".