634739 has 4 divisors (see below), whose sum is σ = 725424. Its totient is φ = 544056.

The previous prime is 634727. The next prime is 634741. The reversal of 634739 is 937436.

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 634739 - 2⁸ = 634483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (634709) 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, 45332 + ... + 45345.

It is an arithmetic number, because the mean of its divisors is an integer number (181356).

2⁶³⁴⁷³⁹ is an apocalyptic number.

634739 is a deficient number, since it is larger than the sum of its proper divisors (90685).

634739 is an equidigital number, since it uses as much as digits as its factorization.

634739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90684.

The product of its digits is 13608, while the sum is 32.

The square root of 634739 is about 796.7050897289. The cubic root of 634739 is about 85.9406025767.

The spelling of 634739 in words is "six hundred thirty-four thousand, seven hundred thirty-nine".