18399770 has 16 divisors (see below), whose sum is σ = 34560000. Its totient is φ = 7039824.

The previous prime is 18399751. The next prime is 18399781. The reversal of 18399770 is 7799381.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39770 + ... + 40229.

It is an arithmetic number, because the mean of its divisors is an integer number (2160000).

Almost surely, 2^18399770 is an apocalyptic number.

18399770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18399770 is a deficient number, since it is larger than the sum of its proper divisors (16160230).

18399770 is a wasteful number, since it uses less digits than its factorization.

18399770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80029.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 18399770 is about 4289.4953083084. The cubic root of 18399770 is about 264.0001243495. Note that the first 3 decimals are identical.

The spelling of 18399770 in words is "eighteen million, three hundred ninety-nine thousand, seven hundred seventy".