851636 has 6 divisors (see below), whose sum is σ = 1490370. Its totient is φ = 425816.

The previous prime is 851633. The next prime is 851639. The reversal of 851636 is 636158.

It is an interprime number because it is at equal distance from previous prime (851633) and next prime (851639).

It can be written as a sum of positive squares in only one way, i.e., 792100 + 59536 = 890^2 + 244^2 .

It is a junction number, because it is equal to n+sod(n) for n = 851599 and 851608.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 851636.

It is not an unprimeable number, because it can be changed into a prime (851633) 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, 106451 + ... + 106458.

It is an arithmetic number, because the mean of its divisors is an integer number (248395).

2⁸⁵¹⁶³⁶ is an apocalyptic number.

It is an amenable number.

851636 is a deficient number, since it is larger than the sum of its proper divisors (638734).

851636 is a wasteful number, since it uses less digits than its factorization.

851636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212913 (or 212911 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 851636 is about 922.8412647904. The cubic root of 851636 is about 94.7875585280.

The spelling of 851636 in words is "eight hundred fifty-one thousand, six hundred thirty-six".