3939621 has 16 divisors (see below), whose sum is σ = 6211200. Its totient is φ = 2173248.

The previous prime is 3939619. The next prime is 3939641. The reversal of 3939621 is 1269393.

3939621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3939621 - 2¹ = 3939619 is a prime.

It is a super-2 number, since 2×3939621² = 31041227247282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3939641) 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 15 ways as a sum of consecutive naturals, for example, 2626 + ... + 3843.

It is an arithmetic number, because the mean of its divisors is an integer number (388200).

Almost surely, 2^3939621 is an apocalyptic number.

It is an amenable number.

3939621 is a deficient number, since it is larger than the sum of its proper divisors (2271579).

3939621 is a wasteful number, since it uses less digits than its factorization.

3939621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6508.

The product of its digits is 8748, while the sum is 33.

The square root of 3939621 is about 1984.8478531112. The cubic root of 3939621 is about 157.9373382883.

It can be divided in two parts, 3939 and 621, that added together give a triangular number (4560 = T₉₅).

The spelling of 3939621 in words is "three million, nine hundred thirty-nine thousand, six hundred twenty-one".