208442839 has 4 divisors (see below), whose sum is σ = 227392200. Its totient is φ = 189493480.

The previous prime is 208442827. The next prime is 208442873. The reversal of 208442839 is 938244802.

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

It is not a de Polignac number, because 208442839 - 2¹³ = 208434647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208442809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9474664 + ... + 9474685.

It is an arithmetic number, because the mean of its divisors is an integer number (56848050).

Almost surely, 2^208442839 is an apocalyptic number.

208442839 is a deficient number, since it is larger than the sum of its proper divisors (18949361).

208442839 is a wasteful number, since it uses less digits than its factorization.

208442839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18949360.

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 208442839 is about 14437.5496189624. The cubic root of 208442839 is about 592.9193992146.

The spelling of 208442839 in words is "two hundred eight million, four hundred forty-two thousand, eight hundred thirty-nine".