813603638 has 4 divisors (see below), whose sum is σ = 1220405460. Its totient is φ = 406801818.

The previous prime is 813603601. The next prime is 813603643. The reversal of 813603638 is 836306318.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203400908 + ... + 203400911.

It is an arithmetic number, because the mean of its divisors is an integer number (305101365).

Almost surely, 2^813603638 is an apocalyptic number.

813603638 is a deficient number, since it is larger than the sum of its proper divisors (406801822).

813603638 is a wasteful number, since it uses less digits than its factorization.

813603638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406801821.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 813603638 is about 28523.7381491276. The cubic root of 813603638 is about 933.5500945809.

The spelling of 813603638 in words is "eight hundred thirteen million, six hundred three thousand, six hundred thirty-eight".