397152209 has 8 divisors (see below), whose sum is σ = 406299648. Its totient is φ = 388033920.

The previous prime is 397152179. The next prime is 397152227. The reversal of 397152209 is 902251793.

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 397152209 - 2¹² = 397148113 is a prime.

It is a super-2 number, since 2×397152209² = 315459754227159362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397152229) 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, 21569 + ... + 35489.

It is an arithmetic number, because the mean of its divisors is an integer number (50787456).

Almost surely, 2^397152209 is an apocalyptic number.

It is an amenable number.

397152209 is a deficient number, since it is larger than the sum of its proper divisors (9147439).

397152209 is a wasteful number, since it uses less digits than its factorization.

397152209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14575.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 397152209 is about 19928.6780545023. The cubic root of 397152209 is about 735.0535750048.

The spelling of 397152209 in words is "three hundred ninety-seven million, one hundred fifty-two thousand, two hundred nine".