18904140 has 36 divisors (see below), whose sum is σ = 57343104. Its totient is φ = 5041056.

The previous prime is 18904111. The next prime is 18904159. The reversal of 18904140 is 4140981.

18904140 = T₂₃₁ + T₂₃₂ + ... + T₅₀₀.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52332 + ... + 52691.

It is an arithmetic number, because the mean of its divisors is an integer number (1592864).

Almost surely, 2^18904140 is an apocalyptic number.

18904140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18904140 is an abundant number, since it is smaller than the sum of its proper divisors (38438964).

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

18904140 is a wasteful number, since it uses less digits than its factorization.

18904140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105038 (or 105033 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 18904140 is about 4347.8891430210. The cubic root of 18904140 is about 266.3906484286.

It can be divided in two parts, 18904 and 140, that added together give a square (19044 = 138²).

The spelling of 18904140 in words is "eighteen million, nine hundred four thousand, one hundred forty".