18734309 has 12 divisors (see below), whose sum is σ = 20799072. Its totient is φ = 16860360.

The previous prime is 18734299. The next prime is 18734333. The reversal of 18734309 is 90343781.

It is not a de Polignac number, because 18734309 - 2⁴ = 18734293 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 (18734809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12224 + ... + 13670.

It is an arithmetic number, because the mean of its divisors is an integer number (1733256).

Almost surely, 2^18734309 is an apocalyptic number.

It is an amenable number.

18734309 is a deficient number, since it is larger than the sum of its proper divisors (2064763).

18734309 is a wasteful number, since it uses less digits than its factorization.

18734309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1576 (or 1565 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 18734309 is about 4328.3147990875. The cubic root of 18734309 is about 265.5905141665.

The spelling of 18734309 in words is "eighteen million, seven hundred thirty-four thousand, three hundred nine".