3938661 has 6 divisors (see below), whose sum is σ = 5689190. Its totient is φ = 2625768.

The previous prime is 3938657. The next prime is 3938699. The reversal of 3938661 is 1668393.

It is a happy number.

3938661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 3802500 + 136161 = 1950^2 + 369^2 .

It is not a de Polignac number, because 3938661 - 2² = 3938657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3931661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 218806 + ... + 218823.

Almost surely, 2^3938661 is an apocalyptic number.

It is an amenable number.

3938661 is a deficient number, since it is larger than the sum of its proper divisors (1750529).

3938661 is a wasteful number, since it uses less digits than its factorization.

3938661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437635 (or 437632 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 3938661 is about 1984.6060062390. The cubic root of 3938661 is about 157.9245086141.

The spelling of 3938661 in words is "three million, nine hundred thirty-eight thousand, six hundred sixty-one".