3930521 has 16 divisors (see below), whose sum is σ = 4730880. Its totient is φ = 3194640.

The previous prime is 3930517. The next prime is 3930527. The reversal of 3930521 is 1250393.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 3930521 - 2² = 3930517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3930527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12650 + ... + 12956.

It is an arithmetic number, because the mean of its divisors is an integer number (295680).

Almost surely, 2^3930521 is an apocalyptic number.

3930521 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3930521 is a deficient number, since it is larger than the sum of its proper divisors (800359).

3930521 is a wasteful number, since it uses less digits than its factorization.

3930521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404.

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 3930521 is about 1982.5541606725. The cubic root of 3930521 is about 157.8156397964.

The spelling of 3930521 in words is "three million, nine hundred thirty thousand, five hundred twenty-one".