18363640 has 16 divisors (see below), whose sum is σ = 41318280. Its totient is φ = 7345440.

The previous prime is 18363601. The next prime is 18363647. The reversal of 18363640 is 4636381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18363647) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 229506 + ... + 229585.

Almost surely, 2^18363640 is an apocalyptic number.

18363640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18363640 is an abundant number, since it is smaller than the sum of its proper divisors (22954640).

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

18363640 is a wasteful number, since it uses less digits than its factorization.

18363640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459102 (or 459098 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 18363640 is about 4285.2817877008. The cubic root of 18363640 is about 263.8272132298.

It can be divided in two parts, 1836 and 3640, that added together give a square (5476 = 74²).

The spelling of 18363640 in words is "eighteen million, three hundred sixty-three thousand, six hundred forty".