18481616 has 10 divisors (see below), whose sum is σ = 35808162. Its totient is φ = 9240800.

The previous prime is 18481583. The next prime is 18481621. The reversal of 18481616 is 61618481.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18318400 + 163216 = 4280^2 + 404^2 .

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, 577535 + ... + 577566.

Almost surely, 2^18481616 is an apocalyptic number.

18481616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18481616 is a deficient number, since it is larger than the sum of its proper divisors (17326546).

18481616 is a wasteful number, since it uses less digits than its factorization.

18481616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155109 (or 1155103 counting only the distinct ones).

The product of its digits is 9216, while the sum is 35.

The square root of 18481616 is about 4299.0250057426. The cubic root of 18481616 is about 264.3909878425.

The spelling of 18481616 in words is "eighteen million, four hundred eighty-one thousand, six hundred sixteen".