1955839 has 2 divisors, whose sum is σ = 1955840. Its totient is φ = 1955838.

The previous prime is 1955831. The next prime is 1955873. The reversal of 1955839 is 9385591.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1955839 - 2³ = 1955831 is a prime.

1955839 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1955831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977919 + 977920.

It is an arithmetic number, because the mean of its divisors is an integer number (977920).

2^1955839 is an apocalyptic number.

1955839 is a deficient number, since it is larger than the sum of its proper divisors (1).

1955839 is an equidigital number, since it uses as much as digits as its factorization.

1955839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600, while the sum is 40.

The square root of 1955839 is about 1398.5131390159. The cubic root of 1955839 is about 125.0578718693.

The spelling of 1955839 in words is "one million, nine hundred fifty-five thousand, eight hundred thirty-nine".