18318416 has 10 divisors (see below), whose sum is σ = 35491962. Its totient is φ = 9159200.

The previous prime is 18318389. The next prime is 18318437. The reversal of 18318416 is 61481381.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18318400 + 16 = 4280^2 + 4^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572435 + ... + 572466.

Almost surely, 2^18318416 is an apocalyptic number.

18318416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18318416 is a deficient number, since it is larger than the sum of its proper divisors (17173546).

18318416 is a wasteful number, since it uses less digits than its factorization.

18318416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144909 (or 1144903 counting only the distinct ones).

The product of its digits is 4608, while the sum is 32.

The square root of 18318416 is about 4280.0018691585. The cubic root of 18318416 is about 263.6104600932.

Adding to 18318416 its reverse (61481381), we get a palindrome (79799797).

It can be divided in two parts, 183184 and 16, that multiplied together give a square (2930944 = 1712²).

The spelling of 18318416 in words is "eighteen million, three hundred eighteen thousand, four hundred sixteen".