397739520 has 240 divisors, whose sum is σ = 1405012752. Its totient is φ = 103956480.

The previous prime is 397739513. The next prime is 397739539. The reversal of 397739520 is 25937793.

397739520 is a `hidden beast` number, since 3 + 97 + 7 + 39 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1405299 + ... + 1405581.

Almost surely, 2^397739520 is an apocalyptic number.

397739520 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 397739520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (702506376).

397739520 is an abundant number, since it is smaller than the sum of its proper divisors (1007273232).

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

397739520 is a wasteful number, since it uses less digits than its factorization.

397739520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373 (or 354 counting only the distinct ones).

The product of its (nonzero) digits is 357210, while the sum is 45.

The square root of 397739520 is about 19943.4079334501. The cubic root of 397739520 is about 735.4157303803.

The spelling of 397739520 in words is "three hundred ninety-seven million, seven hundred thirty-nine thousand, five hundred twenty".