397872670356 has 144 divisors (see below), whose sum is σ = 1195133488640. Its totient is φ = 113377229280.

The previous prime is 397872670343. The next prime is 397872670361. The reversal of 397872670356 is 653076278793.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 397872670293 and 397872670302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2501571 + ... + 2655861.

Almost surely, 2^397872670356 is an apocalyptic number.

397872670356 is a gapful number since it is divisible by the number (36) 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 397872670356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (597566744320).

397872670356 is an abundant number, since it is smaller than the sum of its proper divisors (797260818284).

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

397872670356 is a wasteful number, since it uses less digits than its factorization.

397872670356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154696 (or 154682 counting only the distinct ones).

The product of its (nonzero) digits is 80015040, while the sum is 63.

The spelling of 397872670356 in words is "three hundred ninety-seven billion, eight hundred seventy-two million, six hundred seventy thousand, three hundred fifty-six".