18609897 has 8 divisors (see below), whose sum is σ = 25041280. Its totient is φ = 12292560.

The previous prime is 18609869. The next prime is 18609919. The reversal of 18609897 is 79890681.

It is a happy number.

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

It is not a de Polignac number, because 18609897 - 2⁷ = 18609769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18609397) 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, 28129 + ... + 28782.

It is an arithmetic number, because the mean of its divisors is an integer number (3130160).

Almost surely, 2^18609897 is an apocalyptic number.

It is an amenable number.

18609897 is a deficient number, since it is larger than the sum of its proper divisors (6431383).

18609897 is a wasteful number, since it uses less digits than its factorization.

18609897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57023.

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 18609897 is about 4313.9189839402. The cubic root of 18609897 is about 265.0012910819.

The spelling of 18609897 in words is "eighteen million, six hundred nine thousand, eight hundred ninety-seven".