1878839 has 2 divisors, whose sum is σ = 1878840. Its totient is φ = 1878838.

The previous prime is 1878827. The next prime is 1878841. The reversal of 1878839 is 9388781.

It is a strong prime.

It is an emirp because it is prime and its reverse (9388781) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1878839 is a prime.

Together with 1878841, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1878839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1878869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 939419 + 939420.

It is an arithmetic number, because the mean of its divisors is an integer number (939420).

2^1878839 is an apocalyptic number.

1878839 is a deficient number, since it is larger than the sum of its proper divisors (1).

1878839 is an equidigital number, since it uses as much as digits as its factorization.

1878839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 44.

The square root of 1878839 is about 1370.7074815583. The cubic root of 1878839 is about 123.3947044617.

The spelling of 1878839 in words is "one million, eight hundred seventy-eight thousand, eight hundred thirty-nine".