397591740 has 576 divisors, whose sum is σ = 1643765760. Its totient is φ = 78382080.

The previous prime is 397591729. The next prime is 397591783. The reversal of 397591740 is 47195793.

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 polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 12825525 + ... + 12825555.

It is an arithmetic number, because the mean of its divisors is an integer number (2853760).

Almost surely, 2^397591740 is an apocalyptic number.

397591740 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 397591740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (821882880).

397591740 is an abundant number, since it is smaller than the sum of its proper divisors (1246174020).

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

397591740 is a wasteful number, since it uses less digits than its factorization.

397591740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 238140, while the sum is 45.

The square root of 397591740 is about 19939.7026056057. The cubic root of 397591740 is about 735.3246379325.

The spelling of 397591740 in words is "three hundred ninety-seven million, five hundred ninety-one thousand, seven hundred forty".