635939 has 2 divisors, whose sum is σ = 635940. Its totient is φ = 635938.

The previous prime is 635923. The next prime is 635959. The reversal of 635939 is 939536.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 635939 - 2⁴ = 635923 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 635899 and 635908.

It is not a weakly prime, because it can be changed into another prime (635909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317969 + 317970.

It is an arithmetic number, because the mean of its divisors is an integer number (317970).

2⁶³⁵⁹³⁹ is an apocalyptic number.

635939 is a deficient number, since it is larger than the sum of its proper divisors (1).

635939 is an equidigital number, since it uses as much as digits as its factorization.

635939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21870, while the sum is 35.

The square root of 635939 is about 797.4578358760. The cubic root of 635939 is about 85.9947265560.

The spelling of 635939 in words is "six hundred thirty-five thousand, nine hundred thirty-nine".