18709836 has 12 divisors (see below), whose sum is σ = 43656312. Its totient is φ = 6236608.

The previous prime is 18709811. The next prime is 18709837. The reversal of 18709836 is 63890781.

It is a tau number, because it is divible by the number of its divisors (12).

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (18709837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 779565 + ... + 779588.

It is an arithmetic number, because the mean of its divisors is an integer number (3638026).

Almost surely, 2^18709836 is an apocalyptic number.

It is an amenable number.

18709836 is an abundant number, since it is smaller than the sum of its proper divisors (24946476).

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

18709836 is a wasteful number, since it uses less digits than its factorization.

18709836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1559160 (or 1559158 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 18709836 is about 4325.4867934141. The cubic root of 18709836 is about 265.4748150504.

The spelling of 18709836 in words is "eighteen million, seven hundred nine thousand, eight hundred thirty-six".