18053644 has 24 divisors (see below), whose sum is σ = 36197280. Its totient is φ = 7718016.

The previous prime is 18053641. The next prime is 18053647. The reversal of 18053644 is 44635081.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18053641) and next prime (18053647).

It is not an unprimeable number, because it can be changed into a prime (18053641) 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 7 ways as a sum of consecutive naturals, for example, 21912 + ... + 22720.

It is an arithmetic number, because the mean of its divisors is an integer number (1508220).

Almost surely, 2^18053644 is an apocalyptic number.

18053644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18053644 is an abundant number, since it is smaller than the sum of its proper divisors (18143636).

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

18053644 is a wasteful number, since it uses less digits than its factorization.

18053644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1617 (or 1615 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 18053644 is about 4248.9579899076. The cubic root of 18053644 is about 262.3342276096.

It can be divided in two parts, 180 and 53644, that added together give a square (53824 = 232²).

The spelling of 18053644 in words is "eighteen million, fifty-three thousand, six hundred forty-four".