18040344 has 64 divisors (see below), whose sum is σ = 52285440. Its totient is φ = 5080320.

The previous prime is 18040333. The next prime is 18040387. The reversal of 18040344 is 44304081.

18040344 = 280² + 281² + ... + 423².

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11529 + ... + 12999.

It is an arithmetic number, because the mean of its divisors is an integer number (816960).

Almost surely, 2^18040344 is an apocalyptic number.

18040344 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 18040344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26142720).

18040344 is an abundant number, since it is smaller than the sum of its proper divisors (34245096).

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

18040344 is a wasteful number, since it uses less digits than its factorization.

18040344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560 (or 1556 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 18040344 is about 4247.3926119444. The cubic root of 18040344 is about 262.2697918210.

The spelling of 18040344 in words is "eighteen million, forty thousand, three hundred forty-four".