18347040 has 192 divisors, whose sum is σ = 66769920. Its totient is φ = 4700160.

The previous prime is 18347033. The next prime is 18347051. The reversal of 18347040 is 4074381.

It is a super-2 number, since 2×18347040² = 673227753523200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 18346995 and 18347013.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 133852 + ... + 133988.

It is an arithmetic number, because the mean of its divisors is an integer number (347760).

Almost surely, 2^18347040 is an apocalyptic number.

18347040 is a gapful number since it is divisible by the number (10) 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 18347040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33384960).

18347040 is an abundant number, since it is smaller than the sum of its proper divisors (48422880).

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

18347040 is a wasteful number, since it uses less digits than its factorization.

18347040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 18347040 is about 4283.3444876638. The cubic root of 18347040 is about 263.7476928289.

The spelling of 18347040 in words is "eighteen million, three hundred forty-seven thousand, forty".