18800890 has 32 divisors (see below), whose sum is σ = 36153216. Its totient is φ = 7022400.

The previous prime is 18800879. The next prime is 18800897. The reversal of 18800890 is 9800881.

It is not an unprimeable number, because it can be changed into a prime (18800897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8940 + ... + 10840.

It is an arithmetic number, because the mean of its divisors is an integer number (1129788).

Almost surely, 2^18800890 is an apocalyptic number.

18800890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18800890 is a deficient number, since it is larger than the sum of its proper divisors (17352326).

18800890 is a wasteful number, since it uses less digits than its factorization.

18800890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1974.

The product of its (nonzero) digits is 4608, while the sum is 34.

The square root of 18800890 is about 4335.9993081180. Note that the first 3 decimals coincide. The cubic root of 18800890 is about 265.9047749296.

Subtracting from 18800890 its reverse (9800881), we obtain a palindrome (9000009).

The spelling of 18800890 in words is "eighteen million, eight hundred thousand, eight hundred ninety".