397995280 has 60 divisors (see below), whose sum is σ = 976675212. Its totient is φ = 150808320.

The previous prime is 397995277. The next prime is 397995281. The reversal of 397995280 is 82599793.

It can be written as a sum of positive squares in 2 ways, for example, as 185068816 + 212926464 = 13604^2 + 14592^2 .

It is a super-3 number, since 3×397995280³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (397995281) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21990 + ... + 35770.

Almost surely, 2^397995280 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 397995280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (488337606).

397995280 is an abundant number, since it is smaller than the sum of its proper divisors (578679932).

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

397995280 is a wasteful number, since it uses less digits than its factorization.

397995280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13832 (or 13807 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 52.

The square root of 397995280 is about 19949.8190467984. The cubic root of 397995280 is about 735.5733290231.

The spelling of 397995280 in words is "three hundred ninety-seven million, nine hundred ninety-five thousand, two hundred eighty".