3944921 has 2 divisors, whose sum is σ = 3944922. Its totient is φ = 3944920.

The previous prime is 3944911. The next prime is 3944933. The reversal of 3944921 is 1294493.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3013696 + 931225 = 1736^2 + 965^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3944921 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3944911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1972460 + 1972461.

It is an arithmetic number, because the mean of its divisors is an integer number (1972461).

Almost surely, 2^3944921 is an apocalyptic number.

It is an amenable number.

3944921 is a deficient number, since it is larger than the sum of its proper divisors (1).

3944921 is an equidigital number, since it uses as much as digits as its factorization.

3944921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 32.

The square root of 3944921 is about 1986.1825193068. The cubic root of 3944921 is about 158.0081312912.

It can be divided in two parts, 394492 and 1, that added together give a palindrome (394493).

The spelling of 3944921 in words is "three million, nine hundred forty-four thousand, nine hundred twenty-one".