3939919 has 2 divisors, whose sum is σ = 3939920. Its totient is φ = 3939918.

The previous prime is 3939917. The next prime is 3939931. The reversal of 3939919 is 9199393.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3939919 - 2¹ = 3939917 is a prime.

It is a super-2 number, since 2×3939919² = 31045923453122, which contains 22 as substring.

Together with 3939917, it forms a pair of twin primes.

3939919 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3939917) 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, 1969959 + 1969960.

It is an arithmetic number, because the mean of its divisors is an integer number (1969960).

Almost surely, 2^3939919 is an apocalyptic number.

3939919 is a deficient number, since it is larger than the sum of its proper divisors (1).

3939919 is an equidigital number, since it uses as much as digits as its factorization.

3939919 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 3939919 is about 1984.9229204178. The cubic root of 3939919 is about 157.9413204091.

The spelling of 3939919 in words is "three million, nine hundred thirty-nine thousand, nine hundred nineteen".