1939939 has 2 divisors, whose sum is σ = 1939940. Its totient is φ = 1939938.

The previous prime is 1939937. The next prime is 1939961. The reversal of 1939939 is 9399391.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1939939 - 2¹ = 1939937 is a prime.

Together with 1939937, it forms a pair of twin primes.

1939939 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1939895 and 1939904.

It is not a weakly prime, because it can be changed into another prime (1939937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969969 + 969970.

It is an arithmetic number, because the mean of its divisors is an integer number (969970).

2^1939939 is an apocalyptic number.

1939939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1939939 is an equidigital number, since it uses as much as digits as its factorization.

1939939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 59049, while the sum is 43.

The square root of 1939939 is about 1392.8169298224. The cubic root of 1939939 is about 124.7180632381.

The spelling of 1939939 in words is "one million, nine hundred thirty-nine thousand, nine hundred thirty-nine".