18479493 has 24 divisors (see below), whose sum is σ = 28431000. Its totient is φ = 11526144.

The previous prime is 18479477. The next prime is 18479509. The reversal of 18479493 is 39497481.

It is an interprime number because it is at equal distance from previous prime (18479477) and next prime (18479509).

It can be written as a sum of positive squares in 4 ways, for example, as 1979649 + 16499844 = 1407^2 + 4062^2 .

It is not a de Polignac number, because 18479493 - 2⁴ = 18479477 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18479453) 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 23 ways as a sum of consecutive naturals, for example, 40933 + ... + 41381.

It is an arithmetic number, because the mean of its divisors is an integer number (1184625).

Almost surely, 2^18479493 is an apocalyptic number.

It is an amenable number.

18479493 is a deficient number, since it is larger than the sum of its proper divisors (9951507).

18479493 is a wasteful number, since it uses less digits than its factorization.

18479493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741 (or 738 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 18479493 is about 4298.7780821996. The cubic root of 18479493 is about 264.3808638439.

It can be divided in two parts, 1847 and 9493, that multiplied together give a palindrome (17533571).

The spelling of 18479493 in words is "eighteen million, four hundred seventy-nine thousand, four hundred ninety-three".