18409512 has 64 divisors (see below), whose sum is σ = 50673600. Its totient is φ = 5527040.

The previous prime is 18409507. The next prime is 18409513. The reversal of 18409512 is 21590481.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18409512.

It is not an unprimeable number, because it can be changed into a prime (18409513) 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, 35914 + ... + 36422.

It is an arithmetic number, because the mean of its divisors is an integer number (791775).

Almost surely, 2^18409512 is an apocalyptic number.

18409512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18409512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25336800).

18409512 is an abundant number, since it is smaller than the sum of its proper divisors (32264088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18409512 is a wasteful number, since it uses less digits than its factorization.

18409512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666 (or 662 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 18409512 is about 4290.6307228658. The cubic root of 18409512 is about 264.0467089071.

Adding to 18409512 its reverse (21590481), we get a palindrome (39999993).

The spelling of 18409512 in words is "eighteen million, four hundred nine thousand, five hundred twelve".