634391 has 8 divisors (see below), whose sum is σ = 675120. Its totient is φ = 594432.

The previous prime is 634373. The next prime is 634397. The reversal of 634391 is 193436.

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

It is a cyclic number.

It is not a de Polignac number, because 634391 - 2⁶ = 634327 is a prime.

It is a Duffinian number.

634391 is a Rhonda number in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 634391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634397) 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 7 ways as a sum of consecutive naturals, for example, 3191 + ... + 3383.

It is an arithmetic number, because the mean of its divisors is an integer number (84390).

2⁶³⁴³⁹¹ is an apocalyptic number.

634391 is a deficient number, since it is larger than the sum of its proper divisors (40729).

634391 is a wasteful number, since it uses less digits than its factorization.

634391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385.

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

The square root of 634391 is about 796.4866602775. The cubic root of 634391 is about 85.9248938644.

The spelling of 634391 in words is "six hundred thirty-four thousand, three hundred ninety-one".