776421 has 6 divisors (see below), whose sum is σ = 1121510. Its totient is φ = 517608.

The previous prime is 776401. The next prime is 776429. The reversal of 776421 is 124677.

It can be written as a sum of positive squares in only one way, i.e., 540225 + 236196 = 735^2 + 486^2 .

It is not a de Polignac number, because 776421 - 2⁵ = 776389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (776429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43126 + ... + 43143.

2⁷⁷⁶⁴²¹ is an apocalyptic number.

It is an amenable number.

776421 is a deficient number, since it is larger than the sum of its proper divisors (345089).

776421 is a wasteful number, since it uses less digits than its factorization.

776421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86275 (or 86272 counting only the distinct ones).

The product of its digits is 2352, while the sum is 27.

The square root of 776421 is about 881.1475472360. The cubic root of 776421 is about 91.9106331308.

The spelling of 776421 in words is "seven hundred seventy-six thousand, four hundred twenty-one".