397853409 has 8 divisors (see below), whose sum is σ = 530675712. Its totient is φ = 265133360.

The previous prime is 397853389. The next prime is 397853413. The reversal of 397853409 is 904358793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 397853409 - 2²⁰ = 396804833 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (397853429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15969 + ... + 32414.

It is an arithmetic number, because the mean of its divisors is an integer number (66334464).

Almost surely, 2^397853409 is an apocalyptic number.

It is an amenable number.

397853409 is a deficient number, since it is larger than the sum of its proper divisors (132822303).

397853409 is a wasteful number, since it uses less digits than its factorization.

397853409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51127.

The product of its (nonzero) digits is 816480, while the sum is 48.

The square root of 397853409 is about 19946.2630334607. The cubic root of 397853409 is about 735.4859168256.

The spelling of 397853409 in words is "three hundred ninety-seven million, eight hundred fifty-three thousand, four hundred nine".