397615229 has 4 divisors (see below), whose sum is σ = 433762080. Its totient is φ = 361468380.

The previous prime is 397615213. The next prime is 397615241. The reversal of 397615229 is 922516793.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 397615229 - 2⁴ = 397615213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 397615229.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397615289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18073409 + ... + 18073430.

It is an arithmetic number, because the mean of its divisors is an integer number (108440520).

Almost surely, 2^397615229 is an apocalyptic number.

It is an amenable number.

397615229 is a deficient number, since it is larger than the sum of its proper divisors (36146851).

397615229 is a wasteful number, since it uses less digits than its factorization.

397615229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36146850.

The product of its digits is 204120, while the sum is 44.

The square root of 397615229 is about 19940.2915976673. The cubic root of 397615229 is about 735.3391181967.

The spelling of 397615229 in words is "three hundred ninety-seven million, six hundred fifteen thousand, two hundred twenty-nine".