1540563636 has 24 divisors (see below), whose sum is σ = 3718602720. Its totient is φ = 495813472.

The previous prime is 1540563593. The next prime is 1540563641. The reversal of 1540563636 is 6363650451.

It is a happy number.

1540563636 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 1540563594 and 1540563603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2213106 + ... + 2213801.

It is an arithmetic number, because the mean of its divisors is an integer number (154941780).

Almost surely, 2^1540563636 is an apocalyptic number.

It is an amenable number.

1540563636 is an abundant number, since it is smaller than the sum of its proper divisors (2178039084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1540563636 is a wasteful number, since it uses less digits than its factorization.

1540563636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4426943 (or 4426941 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 39.

The square root of 1540563636 is about 39250.0144713349. The cubic root of 1540563636 is about 1154.9412177501.

The spelling of 1540563636 in words is "one billion, five hundred forty million, five hundred sixty-three thousand, six hundred thirty-six".