18955380 has 48 divisors (see below), whose sum is σ = 53270784. Its totient is φ = 5036160.

The previous prime is 18955379. The next prime is 18955403. The reversal of 18955380 is 8355981.

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 15 ways as a sum of consecutive naturals, for example, 25494 + ... + 26226.

It is an arithmetic number, because the mean of its divisors is an integer number (1109808).

Almost surely, 2^18955380 is an apocalyptic number.

18955380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18955380 is an abundant number, since it is smaller than the sum of its proper divisors (34315404).

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

18955380 is a wasteful number, since it uses less digits than its factorization.

18955380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1176 (or 1174 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 18955380 is about 4353.7776700240. Note that the first 3 decimals coincide. The cubic root of 18955380 is about 266.6311167888.

The spelling of 18955380 in words is "eighteen million, nine hundred fifty-five thousand, three hundred eighty".