776921 has 2 divisors, whose sum is σ = 776922. Its totient is φ = 776920.

The previous prime is 776899. The next prime is 776947. The reversal of 776921 is 129677.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 541696 + 235225 = 736^2 + 485^2 .

It is a cyclic number.

It is not a de Polignac number, because 776921 - 2¹⁴ = 760537 is a prime.

It is a Chen prime.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 776921.

It is not a weakly prime, because it can be changed into another prime (776221) 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 as a sum of consecutive naturals, namely, 388460 + 388461.

It is an arithmetic number, because the mean of its divisors is an integer number (388461).

2⁷⁷⁶⁹²¹ is an apocalyptic number.

It is an amenable number.

776921 is a deficient number, since it is larger than the sum of its proper divisors (1).

776921 is an equidigital number, since it uses as much as digits as its factorization.

776921 is an odious number, because the sum of its binary digits is odd.

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

The square root of 776921 is about 881.4312225012. The cubic root of 776921 is about 91.9303584496.

The spelling of 776921 in words is "seven hundred seventy-six thousand, nine hundred twenty-one".