781323 has 4 divisors (see below), whose sum is σ = 1041768. Its totient is φ = 520880.

The previous prime is 781321. The next prime is 781327. The reversal of 781323 is 323187.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 781323 - 2¹ = 781321 is a prime.

It is a super-2 number, since 2×781323² = 1220931260658, which contains 22 as substring.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 781293 and 781302.

It is not an unprimeable number, because it can be changed into a prime (781321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130218 + ... + 130223.

It is an arithmetic number, because the mean of its divisors is an integer number (260442).

2⁷⁸¹³²³ is an apocalyptic number.

781323 is a deficient number, since it is larger than the sum of its proper divisors (260445).

781323 is a wasteful number, since it uses less digits than its factorization.

781323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260444.

The product of its digits is 1008, while the sum is 24.

The square root of 781323 is about 883.9247705546. The cubic root of 781323 is about 92.1036560092.

The spelling of 781323 in words is "seven hundred eighty-one thousand, three hundred twenty-three".