397805760 has 336 divisors, whose sum is σ = 1547713440. Its totient is φ = 92897280.

The previous prime is 397805743. The next prime is 397805761. The reversal of 397805760 is 67508793.

It is a happy number.

397805760 is a `hidden beast` number, since 3 + 9 + 78 + 0 + 576 + 0 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (397805761) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 918504 + ... + 918936.

It is an arithmetic number, because the mean of its divisors is an integer number (4606290).

Almost surely, 2^397805760 is an apocalyptic number.

397805760 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 397805760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (773856720).

397805760 is an abundant number, since it is smaller than the sum of its proper divisors (1149907680).

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

397805760 is a wasteful number, since it uses less digits than its factorization.

397805760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The square root of 397805760 is about 19945.0685634319. The cubic root of 397805760 is about 735.4565537765.

The spelling of 397805760 in words is "three hundred ninety-seven million, eight hundred five thousand, seven hundred sixty".