397542609 has 6 divisors (see below), whose sum is σ = 574228226. Its totient is φ = 265028400.

The previous prime is 397542583. The next prime is 397542653. The reversal of 397542609 is 906245793.

It is a happy number.

397542609 is a `hidden beast` number, since 39 + 7 + 5 + 4 + 2 + 609 = 666.

It can be written as a sum of positive squares in only one way, i.e., 397404225 + 138384 = 19935^2 + 372^2 .

It is not a de Polignac number, because 397542609 - 2⁵ = 397542577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397542659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22085692 + ... + 22085709.

Almost surely, 2^397542609 is an apocalyptic number.

It is an amenable number.

397542609 is a deficient number, since it is larger than the sum of its proper divisors (176685617).

397542609 is a wasteful number, since it uses less digits than its factorization.

397542609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44171407 (or 44171404 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The square root of 397542609 is about 19938.4705782565. The cubic root of 397542609 is about 735.2943483001.

The spelling of 397542609 in words is "three hundred ninety-seven million, five hundred forty-two thousand, six hundred nine".