18049859 has 2 divisors, whose sum is σ = 18049860. Its totient is φ = 18049858.

The previous prime is 18049853. The next prime is 18049877. The reversal of 18049859 is 95894081.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18049859 is a prime.

It is not a weakly prime, because it can be changed into another prime (18049853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9024929 + 9024930.

It is an arithmetic number, because the mean of its divisors is an integer number (9024930).

Almost surely, 2^18049859 is an apocalyptic number.

18049859 is a deficient number, since it is larger than the sum of its proper divisors (1).

18049859 is an equidigital number, since it uses as much as digits as its factorization.

18049859 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 18049859 is about 4248.5125632390. The cubic root of 18049859 is about 262.3158932787.

The spelling of 18049859 in words is "eighteen million, forty-nine thousand, eight hundred fifty-nine".