18010858 has 4 divisors (see below), whose sum is σ = 27016290. Its totient is φ = 9005428.

The previous prime is 18010829. The next prime is 18010877. The reversal of 18010858 is 85801081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85801081 = 163 ⋅526387.

It can be written as a sum of positive squares in only one way, i.e., 16785409 + 1225449 = 4097^2 + 1107^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4502713 + ... + 4502716.

Almost surely, 2^18010858 is an apocalyptic number.

18010858 is a deficient number, since it is larger than the sum of its proper divisors (9005432).

18010858 is an equidigital number, since it uses as much as digits as its factorization.

18010858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9005431.

The product of its (nonzero) digits is 2560, while the sum is 31.

The square root of 18010858 is about 4243.9201217742. The cubic root of 18010858 is about 262.1268251435.

The spelling of 18010858 in words is "eighteen million, ten thousand, eight hundred fifty-eight".