635438 has 16 divisors (see below), whose sum is σ = 1014144. Its totient is φ = 298080.

The previous prime is 635431. The next prime is 635441. The reversal of 635438 is 834536.

635438 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 635438.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 635438.

It is not an unprimeable number, because it can be changed into a prime (635431) by changing a digit.

635438 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2156 + ... + 2432.

It is an arithmetic number, because the mean of its divisors is an integer number (63384).

2⁶³⁵⁴³⁸ is an apocalyptic number.

635438 is a deficient number, since it is larger than the sum of its proper divisors (378706).

635438 is a wasteful number, since it uses less digits than its factorization.

635438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347.

The product of its digits is 8640, while the sum is 29.

The square root of 635438 is about 797.1436507933. The cubic root of 635438 is about 85.9721380809.

The spelling of 635438 in words is "six hundred thirty-five thousand, four hundred thirty-eight".