212939138 has 4 divisors (see below), whose sum is σ = 319408710. Its totient is φ = 106469568.

The previous prime is 212939119. The next prime is 212939147. The reversal of 212939138 is 831939212.

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

It can be written as a sum of positive squares in only one way, i.e., 208600249 + 4338889 = 14443^2 + 2083^2 .

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 as a sum of consecutive naturals, namely, 53234783 + ... + 53234786.

Almost surely, 2^212939138 is an apocalyptic number.

212939138 is a deficient number, since it is larger than the sum of its proper divisors (106469572).

212939138 is a wasteful number, since it uses less digits than its factorization.

212939138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106469571.

The product of its digits is 23328, while the sum is 38.

The square root of 212939138 is about 14592.4342725948. The cubic root of 212939138 is about 597.1523749520.

The spelling of 212939138 in words is "two hundred twelve million, nine hundred thirty-nine thousand, one hundred thirty-eight".