18907216 has 10 divisors (see below), whose sum is σ = 36632762. Its totient is φ = 9453600.

The previous prime is 18907211. The next prime is 18907237. The reversal of 18907216 is 61270981.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15681600 + 3225616 = 3960^2 + 1796^2 .

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18907211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 590835 + ... + 590866.

Almost surely, 2^18907216 is an apocalyptic number.

18907216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18907216 is a deficient number, since it is larger than the sum of its proper divisors (17725546).

18907216 is a wasteful number, since it uses less digits than its factorization.

18907216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181709 (or 1181703 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 18907216 is about 4348.2428635025. The cubic root of 18907216 is about 266.4050962902.

The spelling of 18907216 in words is "eighteen million, nine hundred seven thousand, two hundred sixteen".