18499380 has 24 divisors (see below), whose sum is σ = 51798432. Its totient is φ = 4933152.

The previous prime is 18499379. The next prime is 18499421. The reversal of 18499380 is 8399481.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 154102 + ... + 154221.

It is an arithmetic number, because the mean of its divisors is an integer number (2158268).

Almost surely, 2^18499380 is an apocalyptic number.

18499380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18499380 is an abundant number, since it is smaller than the sum of its proper divisors (33299052).

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

18499380 is a wasteful number, since it uses less digits than its factorization.

18499380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308335 (or 308333 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 18499380 is about 4301.0905593814. The cubic root of 18499380 is about 264.4756690657.

The spelling of 18499380 in words is "eighteen million, four hundred ninety-nine thousand, three hundred eighty".