18013293 has 16 divisors (see below), whose sum is σ = 26856640. Its totient is φ = 11932272.

The previous prime is 18013291. The next prime is 18013297. The reversal of 18013293 is 39231081.

It is not a de Polignac number, because 18013293 - 2¹ = 18013291 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18013291) 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, 2355 + ... + 6447.

It is an arithmetic number, because the mean of its divisors is an integer number (1678540).

Almost surely, 2^18013293 is an apocalyptic number.

It is an amenable number.

18013293 is a deficient number, since it is larger than the sum of its proper divisors (8843347).

18013293 is a wasteful number, since it uses less digits than its factorization.

18013293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4265 (or 4259 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 18013293 is about 4244.2069930671. The cubic root of 18013293 is about 262.1386374635.

The spelling of 18013293 in words is "eighteen million, thirteen thousand, two hundred ninety-three".