635139243 has 12 divisors (see below), whose sum is σ = 922919088. Its totient is φ = 420889680.

The previous prime is 635139217. The next prime is 635139257. The reversal of 635139243 is 342931536.

It is a happy number.

635139243 is a `hidden beast` number, since 635 + 13 + 9 + 2 + 4 + 3 = 666.

It is not a de Polignac number, because 635139243 - 2⁹ = 635138731 is a prime.

It is a super-2 number, since 2×635139243² = 806803715997226098, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 635139198 and 635139207.

It is not an unprimeable number, because it can be changed into a prime (635139203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 209788 + ... + 212793.

It is an arithmetic number, because the mean of its divisors is an integer number (76909924).

Almost surely, 2^635139243 is an apocalyptic number.

635139243 is a deficient number, since it is larger than the sum of its proper divisors (287779845).

635139243 is a wasteful number, since it uses less digits than its factorization.

635139243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422754 (or 422751 counting only the distinct ones).

The product of its digits is 58320, while the sum is 36.

The square root of 635139243 is about 25201.9690302167. The cubic root of 635139243 is about 859.5866243924.

The spelling of 635139243 in words is "six hundred thirty-five million, one hundred thirty-nine thousand, two hundred forty-three".