797639 has 4 divisors (see below), whose sum is σ = 839640. Its totient is φ = 755640.

The previous prime is 797633. The next prime is 797647. The reversal of 797639 is 936797.

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 797639 - 2⁸ = 797383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 797596 and 797605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (797633) 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 in 3 ways as a sum of consecutive naturals, for example, 20972 + ... + 21009.

It is an arithmetic number, because the mean of its divisors is an integer number (209910).

2⁷⁹⁷⁶³⁹ is an apocalyptic number.

797639 is a deficient number, since it is larger than the sum of its proper divisors (42001).

797639 is a wasteful number, since it uses less digits than its factorization.

797639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42000.

The product of its digits is 71442, while the sum is 41.

The square root of 797639 is about 893.1063766428. The cubic root of 797639 is about 92.7403634251.

The spelling of 797639 in words is "seven hundred ninety-seven thousand, six hundred thirty-nine".