397443179520 has 2112 divisors, whose sum is σ = 1699561543680. Its totient is φ = 88289574912.

The previous prime is 397443179509. The next prime is 397443179533. The reversal of 397443179520 is 25971344793.

397443179520 is a `hidden beast` number, since 3 + 9 + 7 + 4 + 43 + 1 + 79 + 520 = 666.

It is a super-2 number, since 2×397443179520² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 9242864619 + ... + 9242864661.

It is an arithmetic number, because the mean of its divisors is an integer number (804716640).

Almost surely, 2^397443179520 is an apocalyptic number.

397443179520 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 397443179520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (849780771840).

397443179520 is an abundant number, since it is smaller than the sum of its proper divisors (1302118364160).

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

397443179520 is a wasteful number, since it uses less digits than its factorization.

397443179520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 5715360, while the sum is 54.

The spelling of 397443179520 in words is "three hundred ninety-seven billion, four hundred forty-three million, one hundred seventy-nine thousand, five hundred twenty".