397140388 has 12 divisors (see below), whose sum is σ = 713779612. Its totient is φ = 193203360.

The previous prime is 397140371. The next prime is 397140431. The reversal of 397140388 is 883041793.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 335329344 + 61811044 = 18312^2 + 7862^2 .

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1341543 + ... + 1341838.

Almost surely, 2^397140388 is an apocalyptic number.

It is an amenable number.

397140388 is a deficient number, since it is larger than the sum of its proper divisors (316639224).

397140388 is a wasteful number, since it uses less digits than its factorization.

397140388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2683422 (or 2683420 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 397140388 is about 19928.3814696528. The cubic root of 397140388 is about 735.0462821212.

The spelling of 397140388 in words is "three hundred ninety-seven million, one hundred forty thousand, three hundred eighty-eight".