18393316 has 6 divisors (see below), whose sum is σ = 32188310. Its totient is φ = 9196656.

The previous prime is 18393313. The next prime is 18393343. The reversal of 18393316 is 61339381.

It can be written as a sum of positive squares in only one way, i.e., 15570916 + 2822400 = 3946^2 + 1680^2 .

It is a super-3 number, since 3×18393316³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (18393313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2299161 + ... + 2299168.

Almost surely, 2^18393316 is an apocalyptic number.

It is an amenable number.

18393316 is a deficient number, since it is larger than the sum of its proper divisors (13794994).

18393316 is a wasteful number, since it uses less digits than its factorization.

18393316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4598333 (or 4598331 counting only the distinct ones).

The product of its digits is 11664, while the sum is 34.

The square root of 18393316 is about 4288.7429393705. The cubic root of 18393316 is about 263.9692533828.

The spelling of 18393316 in words is "eighteen million, three hundred ninety-three thousand, three hundred sixteen".