18719436 has 48 divisors (see below), whose sum is σ = 44997120. Its totient is φ = 6054720.

The previous prime is 18719429. The next prime is 18719473. The reversal of 18719436 is 63491781.

It is a junction number, because it is equal to n+sod(n) for n = 18719394 and 18719403.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78205 + ... + 78443.

It is an arithmetic number, because the mean of its divisors is an integer number (937440).

Almost surely, 2^18719436 is an apocalyptic number.

It is an amenable number.

18719436 is an abundant number, since it is smaller than the sum of its proper divisors (26277684).

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

18719436 is a wasteful number, since it uses less digits than its factorization.

18719436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414 (or 412 counting only the distinct ones).

The product of its digits is 36288, while the sum is 39.

The square root of 18719436 is about 4326.5963527928. The cubic root of 18719436 is about 265.5202122497.

The spelling of 18719436 in words is "eighteen million, seven hundred nineteen thousand, four hundred thirty-six".