18719812 has 12 divisors (see below), whose sum is σ = 33378156. Its totient is φ = 9183200.

The previous prime is 18719809. The next prime is 18719837. The reversal of 18719812 is 21891781.

It can be written as a sum of positive squares in 2 ways, for example, as 11397376 + 7322436 = 3376^2 + 2706^2 .

It is a super-2 number, since 2×18719812² = 700862722630688, which contains 22 as substring.

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, 43939 + ... + 44362.

It is an arithmetic number, because the mean of its divisors is an integer number (2781513).

Almost surely, 2^18719812 is an apocalyptic number.

It is an amenable number.

18719812 is a deficient number, since it is larger than the sum of its proper divisors (14658344).

18719812 is a wasteful number, since it uses less digits than its factorization.

18719812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88358 (or 88356 counting only the distinct ones).

The product of its digits is 8064, while the sum is 37.

The square root of 18719812 is about 4326.6398047446. The cubic root of 18719812 is about 265.5219899907.

The spelling of 18719812 in words is "eighteen million, seven hundred nineteen thousand, eight hundred twelve".