18403768 has 16 divisors (see below), whose sum is σ = 34994160. Its totient is φ = 9072000.

The previous prime is 18403757. The next prime is 18403769. The reversal of 18403768 is 86730481.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18403769) 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 3 ways as a sum of consecutive naturals, for example, 15633 + ... + 16768.

It is an arithmetic number, because the mean of its divisors is an integer number (2187135).

Almost surely, 2^18403768 is an apocalyptic number.

It is an amenable number.

18403768 is a deficient number, since it is larger than the sum of its proper divisors (16590392).

18403768 is a wasteful number, since it uses less digits than its factorization.

18403768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32478 (or 32474 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 18403768 is about 4289.9613051868. The cubic root of 18403768 is about 264.0192440823.

The spelling of 18403768 in words is "eighteen million, four hundred three thousand, seven hundred sixty-eight".