213838636 has 48 divisors (see below), whose sum is σ = 429504768. Its totient is φ = 92206400.

The previous prime is 213838633. The next prime is 213838643. The reversal of 213838636 is 636838312.

It is not an unprimeable number, because it can be changed into a prime (213838633) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 131766 + ... + 133378.

It is an arithmetic number, because the mean of its divisors is an integer number (8948016).

Almost surely, 2^213838636 is an apocalyptic number.

It is an amenable number.

213838636 is an abundant number, since it is smaller than the sum of its proper divisors (215666132).

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

213838636 is a wasteful number, since it uses less digits than its factorization.

213838636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1782 (or 1780 counting only the distinct ones).

The product of its digits is 124416, while the sum is 40.

The square root of 213838636 is about 14623.2224902721. Note that the first 3 decimals coincide. The cubic root of 213838636 is about 597.9920245913.

The spelling of 213838636 in words is "two hundred thirteen million, eight hundred thirty-eight thousand, six hundred thirty-six".