4000636 has 6 divisors (see below), whose sum is σ = 7001120. Its totient is φ = 2000316.

The previous prime is 4000631. The next prime is 4000649. The reversal of 4000636 is 6360004.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4000631) 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, 500076 + ... + 500083.

Almost surely, 2^4000636 is an apocalyptic number.

It is an amenable number.

4000636 is a deficient number, since it is larger than the sum of its proper divisors (3000484).

4000636 is a wasteful number, since it uses less digits than its factorization.

4000636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000163 (or 1000161 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 4000636 is about 2000.1589936803. The cubic root of 4000636 is about 158.7485179765.

The spelling of 4000636 in words is "four million, six hundred thirty-six", and thus it is an aban number.