768921 has 4 divisors (see below), whose sum is σ = 1025232. Its totient is φ = 512612.

The previous prime is 768881. The next prime is 768923. The reversal of 768921 is 129867.

768921 is an esthetic number in base 4, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 768921 - 2⁶ = 768857 is a prime.

It is a D-number.

It is a nialpdrome in base 16.

It is a zygodrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (768923) 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 3 ways as a sum of consecutive naturals, for example, 128151 + ... + 128156.

It is an arithmetic number, because the mean of its divisors is an integer number (256308).

2⁷⁶⁸⁹²¹ is an apocalyptic number.

It is an amenable number.

768921 is a deficient number, since it is larger than the sum of its proper divisors (256311).

768921 is a wasteful number, since it uses less digits than its factorization.

768921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256310.

The product of its digits is 6048, while the sum is 33.

The square root of 768921 is about 876.8814058925. The cubic root of 768921 is about 91.6137317883.

The spelling of 768921 in words is "seven hundred sixty-eight thousand, nine hundred twenty-one".