1949839 has 2 divisors, whose sum is σ = 1949840. Its totient is φ = 1949838.

The previous prime is 1949833. The next prime is 1949881. The reversal of 1949839 is 9389491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1949839 - 2⁹ = 1949327 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1949795 and 1949804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1949833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 974919 + 974920.

It is an arithmetic number, because the mean of its divisors is an integer number (974920).

2^1949839 is an apocalyptic number.

1949839 is a deficient number, since it is larger than the sum of its proper divisors (1).

1949839 is an equidigital number, since it uses as much as digits as its factorization.

1949839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 43.

The square root of 1949839 is about 1396.3663559396. The cubic root of 1949839 is about 124.9298593163.

The spelling of 1949839 in words is "one million, nine hundred forty-nine thousand, eight hundred thirty-nine".