397868139648 has 384 divisors, whose sum is σ = 1368136526400. Its totient is φ = 113497251840.

The previous prime is 397868139637. The next prime is 397868139701. The reversal of 397868139648 is 846931868793.

397868139648 is a `hidden beast` number, since 397 + 8 + 68 + 139 + 6 + 48 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 137336536 + ... + 137339432.

Almost surely, 2^397868139648 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 397868139648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (684068263200).

397868139648 is an abundant number, since it is smaller than the sum of its proper divisors (970268386752).

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

397868139648 is a wasteful number, since it uses less digits than its factorization.

397868139648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3745 (or 3720 counting only the distinct ones).

The product of its digits is 376233984, while the sum is 72.

The spelling of 397868139648 in words is "three hundred ninety-seven billion, eight hundred sixty-eight million, one hundred thirty-nine thousand, six hundred forty-eight".