847621 has 2 divisors, whose sum is σ = 847622. Its totient is φ = 847620.

The previous prime is 847607. The next prime is 847657. The reversal of 847621 is 126748.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 532900 + 314721 = 730^2 + 561^2 .

It is a cyclic number.

It is not a de Polignac number, because 847621 - 2⁵ = 847589 is a prime.

It is a super-2 number, since 2×847621² = 1436922719282, which contains 22 as substring.

It is equal to p₆₇₄₄₇ and since 847621 and 67447 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 847621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (847601) 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 as a sum of consecutive naturals, namely, 423810 + 423811.

It is an arithmetic number, because the mean of its divisors is an integer number (423811).

2⁸⁴⁷⁶²¹ is an apocalyptic number.

It is an amenable number.

847621 is a deficient number, since it is larger than the sum of its proper divisors (1).

847621 is an equidigital number, since it uses as much as digits as its factorization.

847621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 28.

The square root of 847621 is about 920.6633478096. The cubic root of 847621 is about 94.6383665875.

The spelling of 847621 in words is "eight hundred forty-seven thousand, six hundred twenty-one".