18073815 has 16 divisors (see below), whose sum is σ = 29916000. Its totient is φ = 9306752.

The previous prime is 18073813. The next prime is 18073819. The reversal of 18073815 is 51837081.

It is a cyclic number.

It is not a de Polignac number, because 18073815 - 2¹ = 18073813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18073813) 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 15 ways as a sum of consecutive naturals, for example, 20340 + ... + 21209.

It is an arithmetic number, because the mean of its divisors is an integer number (1869750).

Almost surely, 2^18073815 is an apocalyptic number.

18073815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18073815 is a deficient number, since it is larger than the sum of its proper divisors (11842185).

18073815 is a wasteful number, since it uses less digits than its factorization.

18073815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41586.

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 18073815 is about 4251.3309680616. The cubic root of 18073815 is about 262.4318916272.

The spelling of 18073815 in words is "eighteen million, seventy-three thousand, eight hundred fifteen".