18078313 has 8 divisors (see below), whose sum is σ = 19960416. Its totient is φ = 16236000.

The previous prime is 18078289. The next prime is 18078317. The reversal of 18078313 is 31387081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-18078313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18078317) 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 in 7 ways as a sum of consecutive naturals, for example, 8988 + ... + 10813.

It is an arithmetic number, because the mean of its divisors is an integer number (2495052).

Almost surely, 2^18078313 is an apocalyptic number.

It is an amenable number.

18078313 is a deficient number, since it is larger than the sum of its proper divisors (1882103).

18078313 is a wasteful number, since it uses less digits than its factorization.

18078313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19895.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 18078313 is about 4251.8599459531. The cubic root of 18078313 is about 262.4536601495.

The spelling of 18078313 in words is "eighteen million, seventy-eight thousand, three hundred thirteen".