919939 has 2 divisors, whose sum is σ = 919940. Its totient is φ = 919938.

The previous prime is 919937. The next prime is 919949. The reversal of 919939 is 939919.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 919939 - 2¹ = 919937 is a prime.

Together with 919937, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (919937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459969 + 459970.

It is an arithmetic number, because the mean of its divisors is an integer number (459970).

2⁹¹⁹⁹³⁹ is an apocalyptic number.

919939 is a deficient number, since it is larger than the sum of its proper divisors (1).

919939 is an equidigital number, since it uses as much as digits as its factorization.

919939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19683, while the sum is 40.

The square root of 919939 is about 959.1345056873. The cubic root of 919939 is about 97.2567330121.

The spelling of 919939 in words is "nine hundred nineteen thousand, nine hundred thirty-nine".