18471312 has 30 divisors (see below), whose sum is σ = 51694422. Its totient is φ = 6157056.

The previous prime is 18471281. The next prime is 18471317. The reversal of 18471312 is 21317481.

It can be written as a sum of positive squares in only one way, i.e., 10653696 + 7817616 = 3264^2 + 2796^2 .

It is not an unprimeable number, because it can be changed into a prime (18471317) 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 in 5 ways as a sum of consecutive naturals, for example, 63993 + ... + 64280.

Almost surely, 2^18471312 is an apocalyptic number.

18471312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18471312 is an abundant number, since it is smaller than the sum of its proper divisors (33223110).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18471312 is a wasteful number, since it uses less digits than its factorization.

18471312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128287 (or 128278 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 18471312 is about 4297.8264273933. The cubic root of 18471312 is about 264.3418436698.

Adding to 18471312 its reverse (21317481), we get a palindrome (39788793).

The spelling of 18471312 in words is "eighteen million, four hundred seventy-one thousand, three hundred twelve".