1913939 has 2 divisors, whose sum is σ = 1913940. Its totient is φ = 1913938.

The previous prime is 1913917. The next prime is 1913941. The reversal of 1913939 is 9393191.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (9393191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1913939 - 2⁸ = 1913683 is a prime.

Together with 1913941, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1913899 and 1913908.

It is not a weakly prime, because it can be changed into another prime (1913959) 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, 956969 + 956970.

It is an arithmetic number, because the mean of its divisors is an integer number (956970).

2^1913939 is an apocalyptic number.

1913939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1913939 is an equidigital number, since it uses as much as digits as its factorization.

1913939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6561, while the sum is 35.

The square root of 1913939 is about 1383.4518423133. The cubic root of 1913939 is about 124.1583780983.

The spelling of 1913939 in words is "one million, nine hundred thirteen thousand, nine hundred thirty-nine".