1919839 has 2 divisors, whose sum is σ = 1919840. Its totient is φ = 1919838.

The previous prime is 1919789. The next prime is 1919843. The reversal of 1919839 is 9389191.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1919839 - 2⁷ = 1919711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1919039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959919 + 959920.

It is an arithmetic number, because the mean of its divisors is an integer number (959920).

2^1919839 is an apocalyptic number.

1919839 is a deficient number, since it is larger than the sum of its proper divisors (1).

1919839 is an equidigital number, since it uses as much as digits as its factorization.

1919839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 40.

The square root of 1919839 is about 1385.5825489663. The cubic root of 1919839 is about 124.2858260825.

The spelling of 1919839 in words is "one million, nine hundred nineteen thousand, eight hundred thirty-nine".