18819140 has 12 divisors (see below), whose sum is σ = 39520236. Its totient is φ = 7527648.

The previous prime is 18819137. The next prime is 18819167. The reversal of 18819140 is 4191881.

It can be written as a sum of positive squares in 2 ways, for example, as 2930944 + 15888196 = 1712^2 + 3986^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18819097 and 18819106.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 470459 + ... + 470498.

It is an arithmetic number, because the mean of its divisors is an integer number (3293353).

Almost surely, 2^18819140 is an apocalyptic number.

18819140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18819140 is an abundant number, since it is smaller than the sum of its proper divisors (20701096).

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

18819140 is a wasteful number, since it uses less digits than its factorization.

18819140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940966 (or 940964 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 32.

The square root of 18819140 is about 4338.1032721686. The cubic root of 18819140 is about 265.9907849145.

It can be divided in two parts, 18819 and 140, that multiplied together give a triangular number (2634660 = T₂₂₉₅).

The spelling of 18819140 in words is "eighteen million, eight hundred nineteen thousand, one hundred forty".