18363540 has 72 divisors (see below), whose sum is σ = 55708128. Its totient is φ = 4517760.

The previous prime is 18363539. The next prime is 18363547. The reversal of 18363540 is 4536381.

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 = 18363498 and 18363507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18363547) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9235 + ... + 11045.

It is an arithmetic number, because the mean of its divisors is an integer number (773724).

Almost surely, 2^18363540 is an apocalyptic number.

18363540 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 18363540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27854064).

18363540 is an abundant number, since it is smaller than the sum of its proper divisors (37344588).

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

18363540 is a wasteful number, since it uses less digits than its factorization.

18363540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1849 (or 1834 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 18363540 is about 4285.2701198408. The cubic root of 18363540 is about 263.8267343347.

The spelling of 18363540 in words is "eighteen million, three hundred sixty-three thousand, five hundred forty".