634687 has 2 divisors, whose sum is σ = 634688. Its totient is φ = 634686.

The previous prime is 634681. The next prime is 634703. The reversal of 634687 is 786436.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 634687 - 2³ = 634679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317343 + 317344.

It is an arithmetic number, because the mean of its divisors is an integer number (317344).

2⁶³⁴⁶⁸⁷ is an apocalyptic number.

634687 is a deficient number, since it is larger than the sum of its proper divisors (1).

634687 is an equidigital number, since it uses as much as digits as its factorization.

634687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 34.

The square root of 634687 is about 796.6724546512. The cubic root of 634687 is about 85.9382556628.

The spelling of 634687 in words is "six hundred thirty-four thousand, six hundred eighty-seven".