397747440 has 120 divisors (see below), whose sum is σ = 1346284368. Its totient is φ = 105231360.

The previous prime is 397747429. The next prime is 397747451. The reversal of 397747440 is 44747793.

It is an interprime number because it is at equal distance from previous prime (397747429) and next prime (397747451).

It is a tau number, because it is divible by the number of its divisors (120).

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 23 ways as a sum of consecutive naturals, for example, 92212 + ... + 96428.

Almost surely, 2^397747440 is an apocalyptic number.

397747440 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 397747440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (673142184).

397747440 is an abundant number, since it is smaller than the sum of its proper divisors (948536928).

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

397747440 is a wasteful number, since it uses less digits than its factorization.

397747440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4367 (or 4358 counting only the distinct ones).

The product of its (nonzero) digits is 592704, while the sum is 45.

The square root of 397747440 is about 19943.6064943129. The cubic root of 397747440 is about 735.4206116771.

The spelling of 397747440 in words is "three hundred ninety-seven million, seven hundred forty-seven thousand, four hundred forty".