18055990 has 32 divisors (see below), whose sum is σ = 34038144. Its totient is φ = 6888960.

The previous prime is 18055927. The next prime is 18055993. The reversal of 18055990 is 9955081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18055993) 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 15 ways as a sum of consecutive naturals, for example, 18802 + ... + 19738.

It is an arithmetic number, because the mean of its divisors is an integer number (1063692).

Almost surely, 2^18055990 is an apocalyptic number.

18055990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18055990 is a deficient number, since it is larger than the sum of its proper divisors (15982154).

18055990 is a wasteful number, since it uses less digits than its factorization.

18055990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032.

The product of its (nonzero) digits is 16200, while the sum is 37.

The square root of 18055990 is about 4249.2340486257. The cubic root of 18055990 is about 262.3455902177.

The spelling of 18055990 in words is "eighteen million, fifty-five thousand, nine hundred ninety".