18243136 has 14 divisors (see below), whose sum is σ = 36201350. Its totient is φ = 9121536.

The previous prime is 18243133. The next prime is 18243139. The reversal of 18243136 is 63134281.

It is an interprime number because it is at equal distance from previous prime (18243133) and next prime (18243139).

It can be written as a sum of positive squares in only one way, i.e., 18113536 + 129600 = 4256^2 + 360^2 .

It is a super-2 number, since 2×18243136² = 665624022228992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18243133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142461 + ... + 142588.

Almost surely, 2^18243136 is an apocalyptic number.

18243136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18243136 is a deficient number, since it is larger than the sum of its proper divisors (17958214).

18243136 is an equidigital number, since it uses as much as digits as its factorization.

18243136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285061 (or 285051 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 18243136 is about 4271.1984266714. The cubic root of 18243136 is about 263.2488596574.

The spelling of 18243136 in words is "eighteen million, two hundred forty-three thousand, one hundred thirty-six".