769721 has 4 divisors (see below), whose sum is σ = 777444. Its totient is φ = 762000.

The previous prime is 769687. The next prime is 769723. The reversal of 769721 is 127967.

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

It can be written as a sum of positive squares in 2 ways, for example, as 714025 + 55696 = 845^2 + 236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-769721 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 769721.

It is not an unprimeable number, because it can be changed into a prime (769723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3710 + ... + 3911.

It is an arithmetic number, because the mean of its divisors is an integer number (194361).

2⁷⁶⁹⁷²¹ is an apocalyptic number.

It is an amenable number.

769721 is a deficient number, since it is larger than the sum of its proper divisors (7723).

769721 is a wasteful number, since it uses less digits than its factorization.

769721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7722.

The product of its digits is 5292, while the sum is 32.

The square root of 769721 is about 877.3374493318. The cubic root of 769721 is about 91.6454929975.

The spelling of 769721 in words is "seven hundred sixty-nine thousand, seven hundred twenty-one".