18381063 has 16 divisors (see below), whose sum is σ = 26048736. Its totient is φ = 11489280.

The previous prime is 18381059. The next prime is 18381107. The reversal of 18381063 is 36018381.

It is not a de Polignac number, because 18381063 - 2² = 18381059 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18381063.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18381023) 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 15 ways as a sum of consecutive naturals, for example, 17493 + ... + 18513.

It is an arithmetic number, because the mean of its divisors is an integer number (1628046).

Almost surely, 2^18381063 is an apocalyptic number.

18381063 is a deficient number, since it is larger than the sum of its proper divisors (7667673).

18381063 is a wasteful number, since it uses less digits than its factorization.

18381063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1394.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 18381063 is about 4287.3141942246. The cubic root of 18381063 is about 263.9106245899.

The spelling of 18381063 in words is "eighteen million, three hundred eighty-one thousand, sixty-three".