817380489 has 16 divisors (see below), whose sum is σ = 1110610944. Its totient is φ = 534614400.

The previous prime is 817380481. The next prime is 817380493. The reversal of 817380489 is 984083718.

817380489 = 35² + 36² + ... + 1348².

It is not a de Polignac number, because 817380489 - 2³ = 817380481 is a prime.

It is a super-2 number, since 2×817380489² = 1336221727595758242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (817380481) 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 15 ways as a sum of consecutive naturals, for example, 32059 + ... + 51599.

It is an arithmetic number, because the mean of its divisors is an integer number (69413184).

Almost surely, 2^817380489 is an apocalyptic number.

It is an amenable number.

817380489 is a deficient number, since it is larger than the sum of its proper divisors (293230455).

817380489 is a wasteful number, since it uses less digits than its factorization.

817380489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19808.

The product of its (nonzero) digits is 387072, while the sum is 48.

The square root of 817380489 is about 28589.8668937090. The cubic root of 817380489 is about 934.9924176037.

The spelling of 817380489 in words is "eight hundred seventeen million, three hundred eighty thousand, four hundred eighty-nine".