397288278 has 24 divisors (see below), whose sum is σ = 881787816. Its totient is φ = 129199200.

The previous prime is 397288273. The next prime is 397288279. The reversal of 397288278 is 872882793.

397288278 is a `hidden beast` number, since 3 + 97 + 288 + 278 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397288273) 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, 268428 + ... + 269903.

It is an arithmetic number, because the mean of its divisors is an integer number (36741159).

Almost surely, 2^397288278 is an apocalyptic number.

397288278 is an abundant number, since it is smaller than the sum of its proper divisors (484499538).

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

397288278 is a wasteful number, since it uses less digits than its factorization.

397288278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538380 (or 538377 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The square root of 397288278 is about 19932.0916614388. The cubic root of 397288278 is about 735.1375114086.

The spelling of 397288278 in words is "three hundred ninety-seven million, two hundred eighty-eight thousand, two hundred seventy-eight".