3981949 has 4 divisors (see below), whose sum is σ = 4026780. Its totient is φ = 3937120.

The previous prime is 3981937. The next prime is 3981953. The reversal of 3981949 is 9491893.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 257049 + 3724900 = 507^2 + 1930^2 .

It is a cyclic number.

It is not a de Polignac number, because 3981949 - 2⁵ = 3981917 is a prime.

It is a Duffinian number.

3981949 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981959) 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 in 3 ways as a sum of consecutive naturals, for example, 22282 + ... + 22459.

It is an arithmetic number, because the mean of its divisors is an integer number (1006695).

Almost surely, 2^3981949 is an apocalyptic number.

It is an amenable number.

3981949 is a deficient number, since it is larger than the sum of its proper divisors (44831).

3981949 is an equidigital number, since it uses as much as digits as its factorization.

3981949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44830.

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

The square root of 3981949 is about 1995.4821472516. The cubic root of 3981949 is about 158.5009602983.

The spelling of 3981949 in words is "three million, nine hundred eighty-one thousand, nine hundred forty-nine".