18936709 has 8 divisors (see below), whose sum is σ = 20708928. Its totient is φ = 17172960.

The previous prime is 18936707. The next prime is 18936713. The reversal of 18936709 is 90763981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18936709 - 2¹ = 18936707 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18936703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3144 + ... + 6910.

It is an arithmetic number, because the mean of its divisors is an integer number (2588616).

Almost surely, 2^18936709 is an apocalyptic number.

It is an amenable number.

18936709 is a deficient number, since it is larger than the sum of its proper divisors (1772219).

18936709 is a wasteful number, since it uses less digits than its factorization.

18936709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4235.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 18936709 is about 4351.6329119079. The cubic root of 18936709 is about 266.5435443774.

The spelling of 18936709 in words is "eighteen million, nine hundred thirty-six thousand, seven hundred nine".