18719312 has 20 divisors (see below), whose sum is σ = 38402676. Its totient is φ = 8808960.

The previous prime is 18719303. The next prime is 18719341. The reversal of 18719312 is 21391781.

It can be written as a sum of positive squares in 2 ways, for example, as 4999696 + 13719616 = 2236^2 + 3704^2 .

It is a congruent number.

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, 34139 + ... + 34682.

Almost surely, 2^18719312 is an apocalyptic number.

It is an amenable number.

18719312 is an abundant number, since it is smaller than the sum of its proper divisors (19683364).

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

18719312 is a wasteful number, since it uses less digits than its factorization.

18719312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68846 (or 68840 counting only the distinct ones).

The product of its digits is 3024, while the sum is 32.

The square root of 18719312 is about 4326.5820227981. The cubic root of 18719312 is about 265.5196259681.

The spelling of 18719312 in words is "eighteen million, seven hundred nineteen thousand, three hundred twelve".