18516890 has 16 divisors (see below), whose sum is σ = 38092032. Its totient is φ = 6348624.

The previous prime is 18516881. The next prime is 18516907. The reversal of 18516890 is 9861581.

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, 132194 + ... + 132333.

It is an arithmetic number, because the mean of its divisors is an integer number (2380752).

Almost surely, 2^18516890 is an apocalyptic number.

18516890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18516890 is an abundant number, since it is smaller than the sum of its proper divisors (19575142).

18516890 is a wasteful number, since it uses less digits than its factorization.

18516890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264541.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 18516890 is about 4303.1256082062. The cubic root of 18516890 is about 264.5590864313.

The spelling of 18516890 in words is "eighteen million, five hundred sixteen thousand, eight hundred ninety".