1816523493 has 8 divisors (see below), whose sum is σ = 2432608800. Its totient is φ = 1205726928.

The previous prime is 1816523479. The next prime is 1816523531. The reversal of 1816523493 is 3943256181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1816523493 - 2⁸ = 1816523237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816523413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1321383 + ... + 1322756.

It is an arithmetic number, because the mean of its divisors is an integer number (304076100).

Almost surely, 2^1816523493 is an apocalyptic number.

It is an amenable number.

1816523493 is a deficient number, since it is larger than the sum of its proper divisors (616085307).

1816523493 is a wasteful number, since it uses less digits than its factorization.

1816523493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2644371.

The product of its digits is 155520, while the sum is 42.

The square root of 1816523493 is about 42620.6932487026. The cubic root of 1816523493 is about 1220.1512606953.

The spelling of 1816523493 in words is "one billion, eight hundred sixteen million, five hundred twenty-three thousand, four hundred ninety-three".