18049890 has 32 divisors (see below), whose sum is σ = 44815680. Its totient is φ = 4647104.

The previous prime is 18049883. The next prime is 18049891. The reversal of 18049890 is 9894081.

It is not an unprimeable number, because it can be changed into a prime (18049891) 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, 9504 + ... + 11243.

It is an arithmetic number, because the mean of its divisors is an integer number (1400490).

Almost surely, 2^18049890 is an apocalyptic number.

18049890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18049890 is an abundant number, since it is smaller than the sum of its proper divisors (26765790).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18049890 is a wasteful number, since it uses less digits than its factorization.

18049890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20786.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 18049890 is about 4248.5162115732. The cubic root of 18049890 is about 262.3160434514.

The spelling of 18049890 in words is "eighteen million, forty-nine thousand, eight hundred ninety".