213728238 has 12 divisors (see below), whose sum is σ = 463077888. Its totient is φ = 71242740.

The previous prime is 213728227. The next prime is 213728261. The reversal of 213728238 is 832827312.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5936878 + ... + 5936913.

It is an arithmetic number, because the mean of its divisors is an integer number (38589824).

Almost surely, 2^213728238 is an apocalyptic number.

213728238 is an abundant number, since it is smaller than the sum of its proper divisors (249349650).

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

213728238 is a wasteful number, since it uses less digits than its factorization.

213728238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11873799 (or 11873796 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 213728238 is about 14619.4472535729. The cubic root of 213728238 is about 597.8890988699.

The spelling of 213728238 in words is "two hundred thirteen million, seven hundred twenty-eight thousand, two hundred thirty-eight".