18208897 has 16 divisors (see below), whose sum is σ = 22665600. Its totient is φ = 14273280.

The previous prime is 18208889. The next prime is 18208903. The reversal of 18208897 is 79880281.

It is not a de Polignac number, because 18208897 - 2³ = 18208889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18208837) 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, 1497 + ... + 6217.

It is an arithmetic number, because the mean of its divisors is an integer number (1416600).

Almost surely, 2^18208897 is an apocalyptic number.

It is an amenable number.

18208897 is a deficient number, since it is larger than the sum of its proper divisors (4456703).

18208897 is a wasteful number, since it uses less digits than its factorization.

18208897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4776.

The product of its (nonzero) digits is 64512, while the sum is 43.

The square root of 18208897 is about 4267.1884186195. The cubic root of 18208897 is about 263.0840666743.

The spelling of 18208897 in words is "eighteen million, two hundred eight thousand, eight hundred ninety-seven".