1493217809 has 8 divisors (see below), whose sum is σ = 1573064640. Its totient is φ = 1413496656.

The previous prime is 1493217757. The next prime is 1493217829. The reversal of 1493217809 is 9087123941.

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

It is a cyclic number.

It is not a de Polignac number, because 1493217809 - 2²⁴ = 1476440593 is a prime.

It is a super-2 number, since 2×1493217809² = 4459398850229520962, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1493217809.

It is not an unprimeable number, because it can be changed into a prime (1493217829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6509 + ... + 55034.

It is an arithmetic number, because the mean of its divisors is an integer number (196633080).

Almost surely, 2^1493217809 is an apocalyptic number.

1493217809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1493217809 is a deficient number, since it is larger than the sum of its proper divisors (79846831).

1493217809 is a wasteful number, since it uses less digits than its factorization.

1493217809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62839.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 1493217809 is about 38642.1765561931. The cubic root of 1493217809 is about 1142.9863756293.

The spelling of 1493217809 in words is "one billion, four hundred ninety-three million, two hundred seventeen thousand, eight hundred nine".