18243554 has 32 divisors (see below), whose sum is σ = 33281280. Its totient is φ = 7330752.

The previous prime is 18243541. The next prime is 18243559. The reversal of 18243554 is 45534281.

It is a self number, because there is not a number n which added to its sum of digits gives 18243554.

It is not an unprimeable number, because it can be changed into a prime (18243559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16532 + ... + 17600.

It is an arithmetic number, because the mean of its divisors is an integer number (1040040).

Almost surely, 2^18243554 is an apocalyptic number.

18243554 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18243554 is a deficient number, since it is larger than the sum of its proper divisors (15037726).

18243554 is a wasteful number, since it uses less digits than its factorization.

18243554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154.

The product of its digits is 19200, while the sum is 32.

The square root of 18243554 is about 4271.2473587934. The cubic root of 18243554 is about 263.2508702251.

The spelling of 18243554 in words is "eighteen million, two hundred forty-three thousand, five hundred fifty-four".