397724140 has 24 divisors (see below), whose sum is σ = 911150352. Its totient is φ = 144626880.

The previous prime is 397724111. The next prime is 397724143. The reversal of 397724140 is 41427793.

It is a self number, because there is not a number n which added to its sum of digits gives 397724140.

It is not an unprimeable number, because it can be changed into a prime (397724143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 903699 + ... + 904138.

It is an arithmetic number, because the mean of its divisors is an integer number (37964598).

Almost surely, 2^397724140 is an apocalyptic number.

It is an amenable number.

397724140 is an abundant number, since it is smaller than the sum of its proper divisors (513426212).

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

397724140 is a wasteful number, since it uses less digits than its factorization.

397724140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1807857 (or 1807855 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 397724140 is about 19943.0223386527. The cubic root of 397724140 is about 735.4062511113.

The spelling of 397724140 in words is "three hundred ninety-seven million, seven hundred twenty-four thousand, one hundred forty".