18440324 has 24 divisors (see below), whose sum is σ = 37782528. Its totient is φ = 7709760.

The previous prime is 18440299. The next prime is 18440327. The reversal of 18440324 is 42304481.

It is a junction number, because it is equal to n+sod(n) for n = 18440293 and 18440302.

It is not an unprimeable number, because it can be changed into a prime (18440327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6884 + ... + 9179.

It is an arithmetic number, because the mean of its divisors is an integer number (1574272).

Almost surely, 2^18440324 is an apocalyptic number.

18440324 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18440324 is an abundant number, since it is smaller than the sum of its proper divisors (19342204).

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

18440324 is a wasteful number, since it uses less digits than its factorization.

18440324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16115 (or 16113 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 18440324 is about 4294.2198360121. The cubic root of 18440324 is about 264.1939384561.

The spelling of 18440324 in words is "eighteen million, four hundred forty thousand, three hundred twenty-four".