18470309 has 16 divisors (see below), whose sum is σ = 21833280. Its totient is φ = 15404160.

The previous prime is 18470267. The next prime is 18470321. The reversal of 18470309 is 90307481.

It is a cyclic number.

It is not a de Polignac number, because 18470309 - 2¹² = 18466213 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 (18470329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32177 + ... + 32745.

It is an arithmetic number, because the mean of its divisors is an integer number (1364580).

Almost surely, 2^18470309 is an apocalyptic number.

It is an amenable number.

18470309 is a deficient number, since it is larger than the sum of its proper divisors (3362971).

18470309 is a wasteful number, since it uses less digits than its factorization.

18470309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 18470309 is about 4297.7097389191. The cubic root of 18470309 is about 264.3370589588.

The spelling of 18470309 in words is "eighteen million, four hundred seventy thousand, three hundred nine".