213722634 has 16 divisors (see below), whose sum is σ = 442185120. Its totient is φ = 68784240.

The previous prime is 213722633. The next prime is 213722651. The reversal of 213722634 is 436227312.

It is not an unprimeable number, because it can be changed into a prime (213722633) 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 in 7 ways as a sum of consecutive naturals, for example, 613972 + ... + 614319.

It is an arithmetic number, because the mean of its divisors is an integer number (27636570).

Almost surely, 2^213722634 is an apocalyptic number.

213722634 is an abundant number, since it is smaller than the sum of its proper divisors (228462486).

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

213722634 is a wasteful number, since it uses less digits than its factorization.

213722634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1228325.

The product of its digits is 12096, while the sum is 30.

The square root of 213722634 is about 14619.2555898035. The cubic root of 213722634 is about 597.8838732310.

Adding to 213722634 its reverse (436227312), we get a palindrome (649949946).

The spelling of 213722634 in words is "two hundred thirteen million, seven hundred twenty-two thousand, six hundred thirty-four".