18429009 has 4 divisors (see below), whose sum is σ = 24572016. Its totient is φ = 12286004.

The previous prime is 18428999. The next prime is 18429011. The reversal of 18429009 is 90092481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18429009 - 2¹³ = 18420817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18429079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3071499 + ... + 3071504.

It is an arithmetic number, because the mean of its divisors is an integer number (6143004).

Almost surely, 2^18429009 is an apocalyptic number.

It is an amenable number.

18429009 is a deficient number, since it is larger than the sum of its proper divisors (6143007).

18429009 is an equidigital number, since it uses as much as digits as its factorization.

18429009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6143006.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 18429009 is about 4292.9021652025. The cubic root of 18429009 is about 264.1398908510.

The spelling of 18429009 in words is "eighteen million, four hundred twenty-nine thousand, nine".