836721 has 12 divisors (see below), whose sum is σ = 1248000. Its totient is φ = 539640.

The previous prime is 836713. The next prime is 836729. The reversal of 836721 is 127638.

It is an interprime number because it is at equal distance from previous prime (836713) and next prime (836729).

It is not a de Polignac number, because 836721 - 2³ = 836713 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 836721.

It is not an unprimeable number, because it can be changed into a prime (836729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1221 + ... + 1778.

It is an arithmetic number, because the mean of its divisors is an integer number (104000).

2⁸³⁶⁷²¹ is an apocalyptic number.

It is an amenable number.

836721 is a deficient number, since it is larger than the sum of its proper divisors (411279).

836721 is a wasteful number, since it uses less digits than its factorization.

836721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3036 (or 3033 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 836721 is about 914.7245487031. The cubic root of 836721 is about 94.2309471392.

The spelling of 836721 in words is "eight hundred thirty-six thousand, seven hundred twenty-one".