18003390 has 32 divisors (see below), whose sum is σ = 43338240. Its totient is φ = 4786464.

The previous prime is 18003379. The next prime is 18003407. The reversal of 18003390 is 9330081.

It is a self number, because there is not a number n which added to its sum of digits gives 18003390.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12487 + ... + 13853.

It is an arithmetic number, because the mean of its divisors is an integer number (1354320).

Almost surely, 2^18003390 is an apocalyptic number.

18003390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18003390 is an abundant number, since it is smaller than the sum of its proper divisors (25334850).

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

18003390 is a wasteful number, since it uses less digits than its factorization.

18003390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1816.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 18003390 is about 4243.0401836419. The cubic root of 18003390 is about 262.0905908202.

The spelling of 18003390 in words is "eighteen million, three thousand, three hundred ninety".