18618897 has 16 divisors (see below), whose sum is σ = 27327168. Its totient is φ = 11182080.

The previous prime is 18618877. The next prime is 18618923. The reversal of 18618897 is 79881681.

It is not a de Polignac number, because 18618897 - 2¹¹ = 18616849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18618857) 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, 1233 + ... + 6225.

It is an arithmetic number, because the mean of its divisors is an integer number (1707948).

Almost surely, 2^18618897 is an apocalyptic number.

It is an amenable number.

18618897 is a deficient number, since it is larger than the sum of its proper divisors (8708271).

18618897 is a wasteful number, since it uses less digits than its factorization.

18618897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5120.

The product of its digits is 193536, while the sum is 48.

The square root of 18618897 is about 4314.9619928801. The cubic root of 18618897 is about 265.0440036100.

The spelling of 18618897 in words is "eighteen million, six hundred eighteen thousand, eight hundred ninety-seven".