18308816 has 10 divisors (see below), whose sum is σ = 35473362. Its totient is φ = 9154400.

The previous prime is 18308789. The next prime is 18308819. The reversal of 18308816 is 61880381.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15054400 + 3254416 = 3880^2 + 1804^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18308819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572135 + ... + 572166.

Almost surely, 2^18308816 is an apocalyptic number.

18308816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18308816 is a deficient number, since it is larger than the sum of its proper divisors (17164546).

18308816 is a wasteful number, since it uses less digits than its factorization.

18308816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144309 (or 1144303 counting only the distinct ones).

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

The square root of 18308816 is about 4278.8802273492. The cubic root of 18308816 is about 263.5644025698.

The spelling of 18308816 in words is "eighteen million, three hundred eight thousand, eight hundred sixteen".