212639439 has 8 divisors (see below), whose sum is σ = 295846272. Its totient is φ = 135596120.

The previous prime is 212639411. The next prime is 212639461. The reversal of 212639439 is 934936212.

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

It is a cyclic number.

It is not a de Polignac number, because 212639439 - 2⁷ = 212639311 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212639397 and 212639406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212619439) 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 7 ways as a sum of consecutive naturals, for example, 1540797 + ... + 1540934.

It is an arithmetic number, because the mean of its divisors is an integer number (36980784).

Almost surely, 2^212639439 is an apocalyptic number.

212639439 is a deficient number, since it is larger than the sum of its proper divisors (83206833).

212639439 is a wasteful number, since it uses less digits than its factorization.

212639439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3081757.

The product of its digits is 69984, while the sum is 39.

The square root of 212639439 is about 14582.1616710281. The cubic root of 212639439 is about 596.8720914270.

The spelling of 212639439 in words is "two hundred twelve million, six hundred thirty-nine thousand, four hundred thirty-nine".