1817381493 has 12 divisors (see below), whose sum is σ = 2643994080. Its totient is φ = 1202870376.

The previous prime is 1817381441. The next prime is 1817381509. The reversal of 1817381493 is 3941837181.

1817381493 is a `hidden beast` number, since 1 + 81 + 7 + 3 + 81 + 493 = 666.

It is not a de Polignac number, because 1817381493 - 2¹⁸ = 1817119349 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1817381693) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 725121 + ... + 727622.

It is an arithmetic number, because the mean of its divisors is an integer number (220332840).

Almost surely, 2^1817381493 is an apocalyptic number.

It is an amenable number.

1817381493 is a deficient number, since it is larger than the sum of its proper divisors (826612587).

1817381493 is a wasteful number, since it uses less digits than its factorization.

1817381493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1452888 (or 1452885 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 1817381493 is about 42630.7575935498. The cubic root of 1817381493 is about 1220.3433354657.

The spelling of 1817381493 in words is "one billion, eight hundred seventeen million, three hundred eighty-one thousand, four hundred ninety-three".