18273073 has 16 divisors (see below), whose sum is σ = 22650880. Its totient is φ = 14354496.

The previous prime is 18273071. The next prime is 18273119. The reversal of 18273073 is 37037281.

It is not a de Polignac number, because 18273073 - 2¹ = 18273071 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18273071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13648 + ... + 14926.

It is an arithmetic number, because the mean of its divisors is an integer number (1415680).

Almost surely, 2^18273073 is an apocalyptic number.

18273073 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18273073 is a deficient number, since it is larger than the sum of its proper divisors (4377807).

18273073 is a wasteful number, since it uses less digits than its factorization.

18273073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1456.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 18273073 is about 4274.7015100472. The cubic root of 18273073 is about 263.3927781554.

It can be divided in two parts, 1827 and 3073, that added together give a square (4900 = 70²).

The spelling of 18273073 in words is "eighteen million, two hundred seventy-three thousand, seventy-three".