635389 has 2 divisors, whose sum is σ = 635390. Its totient is φ = 635388.

The previous prime is 635387. The next prime is 635413. The reversal of 635389 is 983536.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 632025 + 3364 = 795^2 + 58^2 .

It is a cyclic number.

It is not a de Polignac number, because 635389 - 2¹ = 635387 is a prime.

Together with 635387, it forms a pair of twin primes.

It is an Ulam number.

635389 is a lucky number.

It is a plaindrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (635387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317694 + 317695.

It is an arithmetic number, because the mean of its divisors is an integer number (317695).

2⁶³⁵³⁸⁹ is an apocalyptic number.

It is an amenable number.

635389 is a deficient number, since it is larger than the sum of its proper divisors (1).

635389 is an equidigital number, since it uses as much as digits as its factorization.

635389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 34.

The square root of 635389 is about 797.1129154643. The cubic root of 635389 is about 85.9699281916.

It can be divided in two parts, 635 and 389, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 635389 in words is "six hundred thirty-five thousand, three hundred eighty-nine".