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822649 = 9072

822649 has 3 divisors (see below), whose sum is σ = 823557. Its totient is φ = 821742.

The previous prime is 822631. The next prime is 822667. The reversal of 822649 is 946228.

The square root of 822649 is 907.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (822631) and next prime (822667).

It is a de Polignac number, because none of the positive numbers 2k-822649 is a prime.

It is a d-powerful number, because it can be written as 8 + 211 + 67 + 213 + 45 + 96 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 822649.

It is not an unprimeable number, because it can be changed into a prime (822049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 454 + ... + 1360.

It is an arithmetic number, because the mean of its divisors is an integer number (274519).

2822649 is an apocalyptic number.

822649 is the 907-th square number.

822649 is the 454-th centered octagonal number.

It is an amenable number.

822649 is a deficient number, since it is larger than the sum of its proper divisors (908).

822649 is an frugal number, since it uses more digits than its factorization.

822649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1814 (or 907 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The cubic root of 822649 is about 93.6996980521.

The spelling of 822649 in words is "eight hundred twenty-two thousand, six hundred forty-nine".

Divisors: 1 907 822649