18185040 has 80 divisors (see below), whose sum is σ = 62644800. Its totient is φ = 4848768.

The previous prime is 18185029. The next prime is 18185077. The reversal of 18185040 is 4058181.

It is a tau number, because it is divible by the number of its divisors (80).

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 = 18184995 and 18185013.

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, 2050 + ... + 6369.

It is an arithmetic number, because the mean of its divisors is an integer number (783060).

Almost surely, 2^18185040 is an apocalyptic number.

18185040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18185040 is an abundant number, since it is smaller than the sum of its proper divisors (44459760).

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

18185040 is a wasteful number, since it uses less digits than its factorization.

18185040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8441 (or 8429 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 18185040 is about 4264.3921020469. The cubic root of 18185040 is about 262.9691203076.

The spelling of 18185040 in words is "eighteen million, one hundred eighty-five thousand, forty".