874639 has 2 divisors, whose sum is σ = 874640. Its totient is φ = 874638.

The previous prime is 874637. The next prime is 874651. The reversal of 874639 is 936478.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 874639 - 2¹ = 874637 is a prime.

Together with 874637, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 874598 and 874607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (874637) 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, 437319 + 437320.

It is an arithmetic number, because the mean of its divisors is an integer number (437320).

2⁸⁷⁴⁶³⁹ is an apocalyptic number.

874639 is a deficient number, since it is larger than the sum of its proper divisors (1).

874639 is an equidigital number, since it uses as much as digits as its factorization.

874639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 37.

The square root of 874639 is about 935.2213641700. The cubic root of 874639 is about 95.6334036501.

It can be divided in two parts, 8 and 74639, that added together give a palindrome (74647).

The spelling of 874639 in words is "eight hundred seventy-four thousand, six hundred thirty-nine".