635140423 has 4 divisors (see below), whose sum is σ = 662755248. Its totient is φ = 607525600.

The previous prime is 635140391. The next prime is 635140439. The reversal of 635140423 is 324041536.

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

It is a cyclic number.

It is not a de Polignac number, because 635140423 - 2⁵ = 635140391 is a prime.

It is a super-3 number, since 3×635140423³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 635140391 and 635140400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (635140463) 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, 13807378 + ... + 13807423.

It is an arithmetic number, because the mean of its divisors is an integer number (165688812).

Almost surely, 2^635140423 is an apocalyptic number.

635140423 is a deficient number, since it is larger than the sum of its proper divisors (27614825).

635140423 is a wasteful number, since it uses less digits than its factorization.

635140423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27614824.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 635140423 is about 25201.9924410750. The cubic root of 635140423 is about 859.5871567227.

Adding to 635140423 its reverse (324041536), we get a palindrome (959181959).

The spelling of 635140423 in words is "six hundred thirty-five million, one hundred forty thousand, four hundred twenty-three".