18072859 has 4 divisors (see below), whose sum is σ = 20654704. Its totient is φ = 15491016.

The previous prime is 18072851. The next prime is 18072869. The reversal of 18072859 is 95827081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18072859 - 2³ = 18072851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18072851) 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, 1290912 + ... + 1290925.

It is an arithmetic number, because the mean of its divisors is an integer number (5163676).

Almost surely, 2^18072859 is an apocalyptic number.

18072859 is a deficient number, since it is larger than the sum of its proper divisors (2581845).

18072859 is an equidigital number, since it uses as much as digits as its factorization.

18072859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2581844.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 18072859 is about 4251.2185311978. The cubic root of 18072859 is about 262.4272645038.

The spelling of 18072859 in words is "eighteen million, seventy-two thousand, eight hundred fifty-nine".