18311648 has 12 divisors (see below), whose sum is σ = 36051120. Its totient is φ = 9155808.

The previous prime is 18311641. The next prime is 18311693. The reversal of 18311648 is 84611381.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 572239 = 18311648 / (1 + 8 + 3 + 1 + 1 + 6 + 4 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18311641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 286088 + ... + 286151.

It is an arithmetic number, because the mean of its divisors is an integer number (3004260).

Almost surely, 2^18311648 is an apocalyptic number.

It is an amenable number.

18311648 is a deficient number, since it is larger than the sum of its proper divisors (17739472).

18311648 is an equidigital number, since it uses as much as digits as its factorization.

18311648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572249 (or 572241 counting only the distinct ones).

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

The square root of 18311648 is about 4279.2111422551. The cubic root of 18311648 is about 263.5779912131.

The spelling of 18311648 in words is "eighteen million, three hundred eleven thousand, six hundred forty-eight".