18312016 has 20 divisors (see below), whose sum is σ = 35572500. Its totient is φ = 9132032.

The previous prime is 18312013. The next prime is 18312037. The reversal of 18312016 is 61021381.

It can be written as a sum of positive squares in 2 ways, for example, as 14470416 + 3841600 = 3804^2 + 1960^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18312013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5910 + ... + 8458.

It is an arithmetic number, because the mean of its divisors is an integer number (1778625).

Almost surely, 2^18312016 is an apocalyptic number.

18312016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18312016 is a deficient number, since it is larger than the sum of its proper divisors (17260484).

18312016 is a wasteful number, since it uses less digits than its factorization.

18312016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3006 (or 3000 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 18312016 is about 4279.2541406184. The cubic root of 18312016 is about 263.5797568661.

Adding to 18312016 its reverse (61021381), we get a palindrome (79333397).

The spelling of 18312016 in words is "eighteen million, three hundred twelve thousand, sixteen".