3999949 has 2 divisors, whose sum is σ = 3999950. Its totient is φ = 3999948.

The previous prime is 3999929. The next prime is 3999971. The reversal of 3999949 is 9499993.

3999949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3222025 + 777924 = 1795^2 + 882^2 .

It is a cyclic number.

It is not a de Polignac number, because 3999949 - 2⁵ = 3999917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3999896 and 3999905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3999929) 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, 1999974 + 1999975.

It is an arithmetic number, because the mean of its divisors is an integer number (1999975).

Almost surely, 2^3999949 is an apocalyptic number.

It is an amenable number.

3999949 is a deficient number, since it is larger than the sum of its proper divisors (1).

3999949 is an equidigital number, since it uses as much as digits as its factorization.

3999949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 708588, while the sum is 52.

The square root of 3999949 is about 1999.9872499594. The cubic root of 3999949 is about 158.7394305485.

The spelling of 3999949 in words is "three million, nine hundred ninety-nine thousand, nine hundred forty-nine".