3993949 has 2 divisors, whose sum is σ = 3993950. Its totient is φ = 3993948.

The previous prime is 3993943. The next prime is 3993953. The reversal of 3993949 is 9493993.

3993949 is an esthetic number in base 13, because in such base its adjacent digits differ by 1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3980025 + 13924 = 1995^2 + 118^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3993949 is a prime.

It is a super-2 number, since 2×3993949² = 31903257229202, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3993899 and 3993908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3993943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1996974 + 1996975.

It is an arithmetic number, because the mean of its divisors is an integer number (1996975).

Almost surely, 2^3993949 is an apocalyptic number.

It is an amenable number.

3993949 is a deficient number, since it is larger than the sum of its proper divisors (1).

3993949 is an equidigital number, since it uses as much as digits as its factorization.

3993949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 236196, while the sum is 46.

The square root of 3993949 is about 1998.4866774637. The cubic root of 3993949 is about 158.6600201023.

The spelling of 3993949 in words is "three million, nine hundred ninety-three thousand, nine hundred forty-nine".