634939 has 2 divisors, whose sum is σ = 634940. Its totient is φ = 634938.

The previous prime is 634937. The next prime is 634943. The reversal of 634939 is 939436.

634939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 634939 - 2¹ = 634937 is a prime.

Together with 634937, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (634937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317469 + 317470.

It is an arithmetic number, because the mean of its divisors is an integer number (317470).

2⁶³⁴⁹³⁹ is an apocalyptic number.

634939 is a deficient number, since it is larger than the sum of its proper divisors (1).

634939 is an equidigital number, since it uses as much as digits as its factorization.

634939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 34.

The square root of 634939 is about 796.8305968021. The cubic root of 634939 is about 85.9496279743.

The spelling of 634939 in words is "six hundred thirty-four thousand, nine hundred thirty-nine".