18085424 has 40 divisors (see below), whose sum is σ = 40428960. Its totient is φ = 7676928.

The previous prime is 18085411. The next prime is 18085439. The reversal of 18085424 is 42458081.

It is a happy number.

It is a super-2 number, since 2×18085424² = 654165122519552, which contains 22 as substring.

18085424 is a modest number, since divided by 5424 gives 1808 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11942 + ... + 13370.

It is an arithmetic number, because the mean of its divisors is an integer number (1010724).

Almost surely, 2^18085424 is an apocalyptic number.

18085424 is a gapful number since it is divisible by the number (14) 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 18085424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20214480).

18085424 is an abundant number, since it is smaller than the sum of its proper divisors (22343536).

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

18085424 is a wasteful number, since it uses less digits than its factorization.

18085424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557 (or 1551 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 18085424 is about 4252.6960860141. The cubic root of 18085424 is about 262.4880671824.

The spelling of 18085424 in words is "eighteen million, eighty-five thousand, four hundred twenty-four".