18243137 has 8 divisors (see below), whose sum is σ = 20364960. Its totient is φ = 16198560.

The previous prime is 18243133. The next prime is 18243139. The reversal of 18243137 is 73134281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18243137 - 2² = 18243133 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18243133) 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, 18812 + ... + 19757.

It is an arithmetic number, because the mean of its divisors is an integer number (2545620).

Almost surely, 2^18243137 is an apocalyptic number.

It is an amenable number.

18243137 is a deficient number, since it is larger than the sum of its proper divisors (2121823).

18243137 is a wasteful number, since it uses less digits than its factorization.

18243137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38623.

The product of its digits is 4032, while the sum is 29.

The square root of 18243137 is about 4271.1985437345. The cubic root of 18243137 is about 263.2488644674.

The spelling of 18243137 in words is "eighteen million, two hundred forty-three thousand, one hundred thirty-seven".