397499760 has 360 divisors, whose sum is σ = 1637372880. Its totient is φ = 85929984.

The previous prime is 397499749. The next prime is 397499771. The reversal of 397499760 is 67994793.

397499760 is a `hidden beast` number, since 3 + 97 + 499 + 7 + 60 = 666.

It is an interprime number because it is at equal distance from previous prime (397499749) and next prime (397499771).

It is a tau number, because it is divible by the number of its divisors (360).

It is a junction number, because it is equal to n+sod(n) for n = 397499697 and 397499706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 670024 + ... + 670616.

It is an arithmetic number, because the mean of its divisors is an integer number (4548258).

Almost surely, 2^397499760 is an apocalyptic number.

397499760 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 397499760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (818686440).

397499760 is an abundant number, since it is smaller than the sum of its proper divisors (1239873120).

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

397499760 is a wasteful number, since it uses less digits than its factorization.

397499760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645 (or 629 counting only the distinct ones).

The product of its (nonzero) digits is 2571912, while the sum is 54.

The square root of 397499760 is about 19937.3960185376. The cubic root of 397499760 is about 735.2679295307.

The spelling of 397499760 in words is "three hundred ninety-seven million, four hundred ninety-nine thousand, seven hundred sixty".