18134809 has 16 divisors (see below), whose sum is σ = 23095296. Its totient is φ = 13827600.

The previous prime is 18134807. The next prime is 18134813. The reversal of 18134809 is 90843181.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18134809 - 2¹ = 18134807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18134807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1114 + ... + 6124.

It is an arithmetic number, because the mean of its divisors is an integer number (1443456).

Almost surely, 2^18134809 is an apocalyptic number.

It is an amenable number.

18134809 is a deficient number, since it is larger than the sum of its proper divisors (4960487).

18134809 is a wasteful number, since it uses less digits than its factorization.

18134809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5076.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 18134809 is about 4258.4984442876. The cubic root of 18134809 is about 262.7267712339.

The spelling of 18134809 in words is "eighteen million, one hundred thirty-four thousand, eight hundred nine".