18049990 has 16 divisors (see below), whose sum is σ = 37131552. Its totient is φ = 6188544.

The previous prime is 18049987. The next prime is 18049991. The reversal of 18049990 is 9994081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18049991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128859 + ... + 128998.

It is an arithmetic number, because the mean of its divisors is an integer number (2320722).

Almost surely, 2^18049990 is an apocalyptic number.

18049990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18049990 is an abundant number, since it is smaller than the sum of its proper divisors (19081562).

18049990 is a wasteful number, since it uses less digits than its factorization.

18049990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257871.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 18049990 is about 4248.5279803716. The cubic root of 18049990 is about 262.3165278783.

The spelling of 18049990 in words is "eighteen million, forty-nine thousand, nine hundred ninety".