204172397 has 16 divisors (see below), whose sum is σ = 253979712. Its totient is φ = 161253120.

The previous prime is 204172393. The next prime is 204172421. The reversal of 204172397 is 793271402.

It is a cyclic number.

It is not a de Polignac number, because 204172397 - 2² = 204172393 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 (204172393) 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, 39563 + ... + 44424.

It is an arithmetic number, because the mean of its divisors is an integer number (15873732).

Almost surely, 2^204172397 is an apocalyptic number.

It is an amenable number.

204172397 is a deficient number, since it is larger than the sum of its proper divisors (49807315).

204172397 is a wasteful number, since it uses less digits than its factorization.

204172397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84028.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 204172397 is about 14288.8906847243. The cubic root of 204172397 is about 588.8423119063.

The spelling of 204172397 in words is "two hundred four million, one hundred seventy-two thousand, three hundred ninety-seven".