18708890 has 16 divisors (see below), whose sum is σ = 35140608. Its totient is φ = 7158096.

The previous prime is 18708889. The next prime is 18708917. The reversal of 18708890 is 9880781.

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, 40442 + ... + 40901.

It is an arithmetic number, because the mean of its divisors is an integer number (2196288).

Almost surely, 2^18708890 is an apocalyptic number.

18708890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18708890 is a deficient number, since it is larger than the sum of its proper divisors (16431718).

18708890 is a wasteful number, since it uses less digits than its factorization.

18708890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81373.

The product of its (nonzero) digits is 32256, while the sum is 41.

The square root of 18708890 is about 4325.3774401779. The cubic root of 18708890 is about 265.4703406942.

The spelling of 18708890 in words is "eighteen million, seven hundred eight thousand, eight hundred ninety".