634839 has 8 divisors (see below), whose sum is σ = 875760. Its totient is φ = 408576.

The previous prime is 634817. The next prime is 634841. The reversal of 634839 is 938436.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 634839 - 2⁵ = 634807 is a prime.

It is a d-powerful number, because it can be written as 6⁷ + 3¹¹ + 8³ + 4² + 3¹¹ + 9² .

634839 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3562 + ... + 3735.

It is an arithmetic number, because the mean of its divisors is an integer number (109470).

2⁶³⁴⁸³⁹ is an apocalyptic number.

634839 is a deficient number, since it is larger than the sum of its proper divisors (240921).

634839 is a wasteful number, since it uses less digits than its factorization.

634839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7329.

The product of its digits is 15552, while the sum is 33.

The square root of 634839 is about 796.7678457368. The cubic root of 634839 is about 85.9451155124.

The spelling of 634839 in words is "six hundred thirty-four thousand, eight hundred thirty-nine".