821769332 has 12 divisors (see below), whose sum is σ = 1438334436. Its totient is φ = 410816640.

The previous prime is 821769313. The next prime is 821769337. The reversal of 821769332 is 233967128.

It can be written as a sum of positive squares in 2 ways, for example, as 87684496 + 734084836 = 9364^2 + 27094^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 821769332.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821769337) 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, 18332 + ... + 44492.

It is an arithmetic number, because the mean of its divisors is an integer number (119861203).

Almost surely, 2^821769332 is an apocalyptic number.

It is an amenable number.

821769332 is a deficient number, since it is larger than the sum of its proper divisors (616565104).

821769332 is a wasteful number, since it uses less digits than its factorization.

821769332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34018 (or 34016 counting only the distinct ones).

The product of its digits is 108864, while the sum is 41.

The square root of 821769332 is about 28666.5193562107. The cubic root of 821769332 is about 936.6628808725.

The spelling of 821769332 in words is "eight hundred twenty-one million, seven hundred sixty-nine thousand, three hundred thirty-two".