18099144 has 48 divisors (see below), whose sum is σ = 56022720. Its totient is φ = 5171040.

The previous prime is 18099143. The next prime is 18099167. The reversal of 18099144 is 44199081.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18099099 and 18099108.

It is not an unprimeable number, because it can be changed into a prime (18099143) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17452 + ... + 18459.

It is an arithmetic number, because the mean of its divisors is an integer number (1167140).

Almost surely, 2^18099144 is an apocalyptic number.

18099144 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18099144 is an abundant number, since it is smaller than the sum of its proper divisors (37923576).

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

18099144 is a wasteful number, since it uses less digits than its factorization.

18099144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35930 (or 35923 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 18099144 is about 4254.3088745412. The cubic root of 18099144 is about 262.5544268096.

The spelling of 18099144 in words is "eighteen million, ninety-nine thousand, one hundred forty-four".