18935040 has 72 divisors (see below), whose sum is σ = 60486048. Its totient is φ = 5048320.

The previous prime is 18935011. The next prime is 18935051. The reversal of 18935040 is 4053981.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 18934989 and 18935007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1375 + ... + 6305.

It is an arithmetic number, because the mean of its divisors is an integer number (840084).

Almost surely, 2^18935040 is an apocalyptic number.

18935040 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 18935040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30243024).

18935040 is an abundant number, since it is smaller than the sum of its proper divisors (41551008).

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

18935040 is an equidigital number, since it uses as much as digits as its factorization.

18935040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4955 (or 4941 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 18935040 is about 4351.4411405878. The cubic root of 18935040 is about 266.5357134805.

The spelling of 18935040 in words is "eighteen million, nine hundred thirty-five thousand, forty".