18042890 has 16 divisors (see below), whose sum is σ = 32735232. Its totient is φ = 7159824.

The previous prime is 18042887. The next prime is 18042917. The reversal of 18042890 is 9824081.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5834 + ... + 8373.

It is an arithmetic number, because the mean of its divisors is an integer number (2045952).

Almost surely, 2^18042890 is an apocalyptic number.

18042890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18042890 is a deficient number, since it is larger than the sum of its proper divisors (14692342).

18042890 is a wasteful number, since it uses less digits than its factorization.

18042890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14341.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 18042890 is about 4247.6923146575. The cubic root of 18042890 is about 262.2821291224.

The spelling of 18042890 in words is "eighteen million, forty-two thousand, eight hundred ninety".