18042086 has 4 divisors (see below), whose sum is σ = 27063132. Its totient is φ = 9021042.

The previous prime is 18042071. The next prime is 18042103. The reversal of 18042086 is 68024081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68024081 = 1291 ⋅52691.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4510520 + ... + 4510523.

It is an arithmetic number, because the mean of its divisors is an integer number (6765783).

Almost surely, 2^18042086 is an apocalyptic number.

18042086 is a deficient number, since it is larger than the sum of its proper divisors (9021046).

18042086 is an equidigital number, since it uses as much as digits as its factorization.

18042086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9021045.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 18042086 is about 4247.5976739800. The cubic root of 18042086 is about 262.2782332579.

The spelling of 18042086 in words is "eighteen million, forty-two thousand, eighty-six".