18554990 has 16 divisors (see below), whose sum is σ = 35363952. Its totient is φ = 6985344.

The previous prime is 18554947. The next prime is 18554999. The reversal of 18554990 is 9945581.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18554999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54404 + ... + 54743.

It is an arithmetic number, because the mean of its divisors is an integer number (2210247).

Almost surely, 2^18554990 is an apocalyptic number.

18554990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18554990 is a deficient number, since it is larger than the sum of its proper divisors (16808962).

18554990 is a wasteful number, since it uses less digits than its factorization.

18554990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109171.

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 18554990 is about 4307.5503479356. The cubic root of 18554990 is about 264.7404127019.

The spelling of 18554990 in words is "eighteen million, five hundred fifty-four thousand, nine hundred ninety".