18273090 has 32 divisors (see below), whose sum is σ = 47843136. Its totient is φ = 4429760.

The previous prime is 18273071. The next prime is 18273119. The reversal of 18273090 is 9037281.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

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, 27357 + ... + 28016.

It is an arithmetic number, because the mean of its divisors is an integer number (1495098).

Almost surely, 2^18273090 is an apocalyptic number.

18273090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18273090 is an abundant number, since it is smaller than the sum of its proper divisors (29570046).

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

18273090 is a wasteful number, since it uses less digits than its factorization.

18273090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55394.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 18273090 is about 4274.7034984897. The cubic root of 18273090 is about 263.3928598361.

The spelling of 18273090 in words is "eighteen million, two hundred seventy-three thousand, ninety".