397280187380 has 24 divisors (see below), whose sum is σ = 837389848680. Its totient is φ = 158321321600.

The previous prime is 397280187373. The next prime is 397280187383. The reversal of 397280187380 is 83781082793.

It can be written as a sum of positive squares in 4 ways, for example, as 5709615844 + 391570571536 = 75562^2 + 625756^2 .

It is a super-2 number, since 2×397280187380² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397280187383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36916571 + ... + 36927330.

It is an arithmetic number, because the mean of its divisors is an integer number (34891243695).

Almost surely, 2^397280187380 is an apocalyptic number.

It is an amenable number.

397280187380 is an abundant number, since it is smaller than the sum of its proper divisors (440109661300).

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

397280187380 is a wasteful number, since it uses less digits than its factorization.

397280187380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73844179 (or 73844177 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 56.

The spelling of 397280187380 in words is "three hundred ninety-seven billion, two hundred eighty million, one hundred eighty-seven thousand, three hundred eighty".