635979 has 8 divisors (see below), whose sum is σ = 852480. Its totient is φ = 421736.

The previous prime is 635977. The next prime is 635981. The reversal of 635979 is 979536.

635979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (635977) and next prime (635981).

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 635979 - 2¹ = 635977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (635977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274 + ... + 1160.

It is an arithmetic number, because the mean of its divisors is an integer number (106560).

2⁶³⁵⁹⁷⁹ is an apocalyptic number.

635979 is a deficient number, since it is larger than the sum of its proper divisors (216501).

635979 is a wasteful number, since it uses less digits than its factorization.

635979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129.

The product of its digits is 51030, while the sum is 39.

The square root of 635979 is about 797.4829151775. The cubic root of 635979 is about 85.9965295156.

The spelling of 635979 in words is "six hundred thirty-five thousand, nine hundred seventy-nine".