3921949 has 2 divisors, whose sum is σ = 3921950. Its totient is φ = 3921948.

The previous prime is 3921941. The next prime is 3921959. The reversal of 3921949 is 9491293.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3348900 + 573049 = 1830^2 + 757^2 .

It is a cyclic number.

It is not a de Polignac number, because 3921949 - 2³ = 3921941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3921941) 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, 1960974 + 1960975.

It is an arithmetic number, because the mean of its divisors is an integer number (1960975).

Almost surely, 2^3921949 is an apocalyptic number.

It is an amenable number.

3921949 is a deficient number, since it is larger than the sum of its proper divisors (1).

3921949 is an equidigital number, since it uses as much as digits as its factorization.

3921949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 37.

The square root of 3921949 is about 1980.3911229856. The cubic root of 3921949 is about 157.7008305648.

The spelling of 3921949 in words is "three million, nine hundred twenty-one thousand, nine hundred forty-nine".