3918949 has 2 divisors, whose sum is σ = 3918950. Its totient is φ = 3918948.

The previous prime is 3918923. The next prime is 3918983. The reversal of 3918949 is 9498193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3744225 + 174724 = 1935^2 + 418^2 .

It is an emirp because it is prime and its reverse (9498193) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3918949 - 2¹¹ = 3916901 is a prime.

It is a super-2 number, since 2×3918949² = 30716322529202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3918919) 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, 1959474 + 1959475.

It is an arithmetic number, because the mean of its divisors is an integer number (1959475).

Almost surely, 2^3918949 is an apocalyptic number.

It is an amenable number.

3918949 is a deficient number, since it is larger than the sum of its proper divisors (1).

3918949 is an equidigital number, since it uses as much as digits as its factorization.

3918949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 43.

The square root of 3918949 is about 1979.6335519484. The cubic root of 3918949 is about 157.6606104963.

The spelling of 3918949 in words is "three million, nine hundred eighteen thousand, nine hundred forty-nine".