3940521 has 24 divisors (see below), whose sum is σ = 5945856. Its totient is φ = 2307360.

The previous prime is 3940513. The next prime is 3940523. The reversal of 3940521 is 1250493.

It is not a de Polignac number, because 3940521 - 2³ = 3940513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3940491 and 3940500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3940523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20536 + ... + 20726.

It is an arithmetic number, because the mean of its divisors is an integer number (247744).

Almost surely, 2^3940521 is an apocalyptic number.

It is an amenable number.

3940521 is a deficient number, since it is larger than the sum of its proper divisors (2005335).

3940521 is a wasteful number, since it uses less digits than its factorization.

3940521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253 (or 230 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 3940521 is about 1985.0745577937. The cubic root of 3940521 is about 157.9493642152.

The spelling of 3940521 in words is "three million, nine hundred forty thousand, five hundred twenty-one".