18491336 has 8 divisors (see below), whose sum is σ = 34671270. Its totient is φ = 9245664.

The previous prime is 18491323. The next prime is 18491339. The reversal of 18491336 is 63319481.

It can be written as a sum of positive squares in only one way, i.e., 18438436 + 52900 = 4294^2 + 230^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 18491296 and 18491305.

It is not an unprimeable number, because it can be changed into a prime (18491339) 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 as a sum of consecutive naturals, namely, 1155701 + ... + 1155716.

Almost surely, 2^18491336 is an apocalyptic number.

It is an amenable number.

18491336 is a deficient number, since it is larger than the sum of its proper divisors (16179934).

18491336 is a wasteful number, since it uses less digits than its factorization.

18491336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2311423 (or 2311419 counting only the distinct ones).

The product of its digits is 15552, while the sum is 35.

The square root of 18491336 is about 4300.1553460311. The cubic root of 18491336 is about 264.4373299302.

The spelling of 18491336 in words is "eighteen million, four hundred ninety-one thousand, three hundred thirty-six".