212665538 has 8 divisors (see below), whose sum is σ = 319795020. Its totient is φ = 106067200.

The previous prime is 212665469. The next prime is 212665561. The reversal of 212665538 is 835566212.

It can be written as a sum of positive squares in 2 ways, for example, as 139169209 + 73496329 = 11797^2 + 8573^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131783 + ... + 133386.

Almost surely, 2^212665538 is an apocalyptic number.

212665538 is a deficient number, since it is larger than the sum of its proper divisors (107129482).

212665538 is a wasteful number, since it uses less digits than its factorization.

212665538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265572.

The product of its digits is 86400, while the sum is 38.

The square root of 212665538 is about 14583.0565383256. The cubic root of 212665538 is about 596.8965101136.

The spelling of 212665538 in words is "two hundred twelve million, six hundred sixty-five thousand, five hundred thirty-eight".