397635760 has 80 divisors (see below), whose sum is σ = 959938560. Its totient is φ = 153020160.

The previous prime is 397635739. The next prime is 397635761. The reversal of 397635760 is 67536793.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×397635760² = 316228395261555200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 397635760.

It is not an unprimeable number, because it can be changed into a prime (397635761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 552681 + ... + 553399.

It is an arithmetic number, because the mean of its divisors is an integer number (11999232).

Almost surely, 2^397635760 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 397635760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (479969280).

397635760 is an abundant number, since it is smaller than the sum of its proper divisors (562302800).

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

397635760 is a wasteful number, since it uses less digits than its factorization.

397635760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 986 (or 980 counting only the distinct ones).

The product of its (nonzero) digits is 714420, while the sum is 46.

The square root of 397635760 is about 19940.8064029517. The cubic root of 397635760 is about 735.3517744755.

The spelling of 397635760 in words is "three hundred ninety-seven million, six hundred thirty-five thousand, seven hundred sixty".