18055493 has 2 divisors, whose sum is σ = 18055494. Its totient is φ = 18055492.

The previous prime is 18055489. The next prime is 18055507. The reversal of 18055493 is 39455081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14303524 + 3751969 = 3782^2 + 1937^2 .

It is a cyclic number.

It is not a de Polignac number, because 18055493 - 2² = 18055489 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18055393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9027746 + 9027747.

It is an arithmetic number, because the mean of its divisors is an integer number (9027747).

Almost surely, 2^18055493 is an apocalyptic number.

It is an amenable number.

18055493 is a deficient number, since it is larger than the sum of its proper divisors (1).

18055493 is an equidigital number, since it uses as much as digits as its factorization.

18055493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 18055493 is about 4249.1755670953. The cubic root of 18055493 is about 262.3431831318.

The spelling of 18055493 in words is "eighteen million, fifty-five thousand, four hundred ninety-three".