634139 has 4 divisors (see below), whose sum is σ = 691800. Its totient is φ = 576480.

The previous prime is 634103. The next prime is 634141. The reversal of 634139 is 931436.

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 634139 - 2⁸ = 633883 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 (634159) 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, 28814 + ... + 28835.

It is an arithmetic number, because the mean of its divisors is an integer number (172950).

2⁶³⁴¹³⁹ is an apocalyptic number.

634139 is a deficient number, since it is larger than the sum of its proper divisors (57661).

634139 is a wasteful number, since it uses less digits than its factorization.

634139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57660.

The product of its digits is 1944, while the sum is 26.

The square root of 634139 is about 796.3284498246. The cubic root of 634139 is about 85.9135150034.

The spelling of 634139 in words is "six hundred thirty-four thousand, one hundred thirty-nine".