18273406 has 4 divisors (see below), whose sum is σ = 27410112. Its totient is φ = 9136702.

The previous prime is 18273403. The next prime is 18273407. The reversal of 18273406 is 60437281.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18273403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4568350 + ... + 4568353.

It is an arithmetic number, because the mean of its divisors is an integer number (6852528).

Almost surely, 2^18273406 is an apocalyptic number.

18273406 is a deficient number, since it is larger than the sum of its proper divisors (9136706).

18273406 is an equidigital number, since it uses as much as digits as its factorization.

18273406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9136705.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 18273406 is about 4274.7404599578. The cubic root of 18273406 is about 263.3943781282.

The spelling of 18273406 in words is "eighteen million, two hundred seventy-three thousand, four hundred six".