397145353640 has 256 divisors, whose sum is σ = 1081932042240. Its totient is φ = 128314368000.

The previous prime is 397145353637. The next prime is 397145353667. The reversal of 397145353640 is 46353541793.

It is a super-2 number, since 2×397145353640² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 363352934 + ... + 363354026.

It is an arithmetic number, because the mean of its divisors is an integer number (4226297040).

Almost surely, 2^397145353640 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 397145353640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (540966021120).

397145353640 is an abundant number, since it is smaller than the sum of its proper divisors (684786688600).

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

397145353640 is a wasteful number, since it uses less digits than its factorization.

397145353640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2204 (or 2200 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 50.

The spelling of 397145353640 in words is "three hundred ninety-seven billion, one hundred forty-five million, three hundred fifty-three thousand, six hundred forty".