397794723840 has 384 divisors, whose sum is σ = 1425295872000. Its totient is φ = 105234038784.

The previous prime is 397794723757. The next prime is 397794723857. The reversal of 397794723840 is 48327497793.

397794723840 is a `hidden beast` number, since 3 + 97 + 7 + 9 + 472 + 38 + 40 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35107296 + ... + 35118624.

It is an arithmetic number, because the mean of its divisors is an integer number (3711708000).

Almost surely, 2^397794723840 is an apocalyptic number.

397794723840 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 397794723840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (712647936000).

397794723840 is an abundant number, since it is smaller than the sum of its proper divisors (1027501148160).

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

397794723840 is a wasteful number, since it uses less digits than its factorization.

397794723840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11492 (or 11466 counting only the distinct ones).

The product of its (nonzero) digits is 64012032, while the sum is 63.

The spelling of 397794723840 in words is "three hundred ninety-seven billion, seven hundred ninety-four million, seven hundred twenty-three thousand, eight hundred forty".