802639 has 4 divisors (see below), whose sum is σ = 809856. Its totient is φ = 795424.

The previous prime is 802609. The next prime is 802643. The reversal of 802639 is 936208.

802639 = T₇₃₀ + T₇₃₁ + T₇₃₂.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 802639 - 2⁷ = 802511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (802609) 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 in 3 ways as a sum of consecutive naturals, for example, 3439 + ... + 3664.

It is an arithmetic number, because the mean of its divisors is an integer number (202464).

2⁸⁰²⁶³⁹ is an apocalyptic number.

802639 is the 732-nd centered triangular number.

802639 is a deficient number, since it is larger than the sum of its proper divisors (7217).

802639 is a wasteful number, since it uses less digits than its factorization.

802639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7216.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 802639 is about 895.9012222338. The cubic root of 802639 is about 92.9337409106.

It can be divided in two parts, 802 and 639, that added together give a palindrome (1441).

The spelling of 802639 in words is "eight hundred two thousand, six hundred thirty-nine".