397388509 has 16 divisors (see below), whose sum is σ = 459337600. Its totient is φ = 336757824.

The previous prime is 397388489. The next prime is 397388521. The reversal of 397388509 is 905883793.

It is a cyclic number.

It is not a de Polignac number, because 397388509 - 2¹¹ = 397386461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397388539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 250882 + ... + 252460.

It is an arithmetic number, because the mean of its divisors is an integer number (28708600).

Almost surely, 2^397388509 is an apocalyptic number.

It is an amenable number.

397388509 is a deficient number, since it is larger than the sum of its proper divisors (61949091).

397388509 is a wasteful number, since it uses less digits than its factorization.

397388509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1972.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The square root of 397388509 is about 19934.6058150143. The cubic root of 397388509 is about 735.1993282944.

The spelling of 397388509 in words is "three hundred ninety-seven million, three hundred eighty-eight thousand, five hundred nine".