397355540 has 12 divisors (see below), whose sum is σ = 834446676. Its totient is φ = 158942208.

The previous prime is 397355537. The next prime is 397355597. The reversal of 397355540 is 45553793.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 123254404 + 274101136 = 11102^2 + 16556^2 .

It is a congruent number.

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, 9933869 + ... + 9933908.

It is an arithmetic number, because the mean of its divisors is an integer number (69537223).

Almost surely, 2^397355540 is an apocalyptic number.

It is an amenable number.

397355540 is an abundant number, since it is smaller than the sum of its proper divisors (437091136).

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

397355540 is a wasteful number, since it uses less digits than its factorization.

397355540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19867786 (or 19867784 counting only the distinct ones).

The product of its (nonzero) digits is 283500, while the sum is 41.

The square root of 397355540 is about 19933.7788690454. The cubic root of 397355540 is about 735.1789960029.

The spelling of 397355540 in words is "three hundred ninety-seven million, three hundred fifty-five thousand, five hundred forty".