18709436 has 6 divisors (see below), whose sum is σ = 32741520. Its totient is φ = 9354716.

The previous prime is 18709417. The next prime is 18709447. The reversal of 18709436 is 63490781.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18709436.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2338676 + ... + 2338683.

It is an arithmetic number, because the mean of its divisors is an integer number (5456920).

Almost surely, 2^18709436 is an apocalyptic number.

It is an amenable number.

18709436 is a deficient number, since it is larger than the sum of its proper divisors (14032084).

18709436 is a wasteful number, since it uses less digits than its factorization.

18709436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4677363 (or 4677361 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 18709436 is about 4325.4405555966. The cubic root of 18709436 is about 265.4729231634.

The spelling of 18709436 in words is "eighteen million, seven hundred nine thousand, four hundred thirty-six".