18323949 has 16 divisors (see below), whose sum is σ = 28307072. Its totient is φ = 10326528.

The previous prime is 18323947. The next prime is 18323957. The reversal of 18323949 is 94932381.

It is not a de Polignac number, because 18323949 - 2¹ = 18323947 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18323947) 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, 4444 + ... + 7509.

It is an arithmetic number, because the mean of its divisors is an integer number (1769192).

Almost surely, 2^18323949 is an apocalyptic number.

It is an amenable number.

18323949 is a deficient number, since it is larger than the sum of its proper divisors (9983123).

18323949 is a wasteful number, since it uses less digits than its factorization.

18323949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12036.

The product of its digits is 46656, while the sum is 39.

The square root of 18323949 is about 4280.6481985793. The cubic root of 18323949 is about 263.6369982293.

The spelling of 18323949 in words is "eighteen million, three hundred twenty-three thousand, nine hundred forty-nine".