211142439 has 6 divisors (see below), whose sum is σ = 304983536. Its totient is φ = 140761620.

The previous prime is 211142429. The next prime is 211142467. The reversal of 211142439 is 934241112.

It is a happy number.

211142439 is a `hidden beast` number, since 211 + 14 + 2 + 439 = 666.

It is not a de Polignac number, because 211142439 - 2⁴ = 211142423 is a prime.

It is a super-2 number, since 2×211142439² = 89162259093737442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211142429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11730127 + ... + 11730144.

Almost surely, 2^211142439 is an apocalyptic number.

211142439 is a deficient number, since it is larger than the sum of its proper divisors (93841097).

211142439 is a wasteful number, since it uses less digits than its factorization.

211142439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23460277 (or 23460274 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 211142439 is about 14530.7411717366. The cubic root of 211142439 is about 595.4681145382.

The spelling of 211142439 in words is "two hundred eleven million, one hundred forty-two thousand, four hundred thirty-nine".