18243049 has 6 divisors (see below), whose sum is σ = 20052410. Its totient is φ = 16584480.

The previous prime is 18243047. The next prime is 18243053. The reversal of 18243049 is 94034281.

It can be written as a sum of positive squares in only one way, i.e., 18215824 + 27225 = 4268^2 + 165^2 .

It is not a de Polignac number, because 18243049 - 2¹ = 18243047 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18243049.

It is not an unprimeable number, because it can be changed into a prime (18243041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 75264 + ... + 75505.

Almost surely, 2^18243049 is an apocalyptic number.

It is an amenable number.

18243049 is a deficient number, since it is larger than the sum of its proper divisors (1809361).

18243049 is a wasteful number, since it uses less digits than its factorization.

18243049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150791 (or 150780 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 18243049 is about 4271.1882421640. The cubic root of 18243049 is about 263.2484411861.

The spelling of 18243049 in words is "eighteen million, two hundred forty-three thousand, forty-nine".