1942139 has 2 divisors, whose sum is σ = 1942140. Its totient is φ = 1942138.

The previous prime is 1942133. The next prime is 1942141. The reversal of 1942139 is 9312491.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (9312491) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1942139 is a prime.

Together with 1942141, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1942133) 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, 971069 + 971070.

It is an arithmetic number, because the mean of its divisors is an integer number (971070).

2^1942139 is an apocalyptic number.

1942139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1942139 is an equidigital number, since it uses as much as digits as its factorization.

1942139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 29.

The square root of 1942139 is about 1393.6064724304. The cubic root of 1942139 is about 124.7651911948.

The spelling of 1942139 in words is "one million, nine hundred forty-two thousand, one hundred thirty-nine".