635399 has 4 divisors (see below), whose sum is σ = 641136. Its totient is φ = 629664.

The previous prime is 635389. The next prime is 635413. The reversal of 635399 is 993536.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-635399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (635309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2699 + ... + 2924.

It is an arithmetic number, because the mean of its divisors is an integer number (160284).

2⁶³⁵³⁹⁹ is an apocalyptic number.

635399 is a deficient number, since it is larger than the sum of its proper divisors (5737).

635399 is a wasteful number, since it uses less digits than its factorization.

635399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5736.

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

The square root of 635399 is about 797.1191880767. The cubic root of 635399 is about 85.9703791986.

The spelling of 635399 in words is "six hundred thirty-five thousand, three hundred ninety-nine".