18455040 has 200 divisors, whose sum is σ = 66842820. Its totient is φ = 4866048.

The previous prime is 18455033. The next prime is 18455071. The reversal of 18455040 is 4055481.

It can be written as a sum of positive squares in 2 ways, for example, as 17438976 + 1016064 = 4176^2 + 1008^2 .

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 18454995 and 18455013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 207316 + ... + 207404.

Almost surely, 2^18455040 is an apocalyptic number.

18455040 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 18455040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33421410).

18455040 is an abundant number, since it is smaller than the sum of its proper divisors (48387780).

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

18455040 is an frugal number, since it uses more digits than its factorization.

18455040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124 (or 99 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 18455040 is about 4295.9329603708. The cubic root of 18455040 is about 264.2641983249.

The spelling of 18455040 in words is "eighteen million, four hundred fifty-five thousand, forty".