3975921 has 12 divisors (see below), whose sum is σ = 6045520. Its totient is φ = 2511000.

The previous prime is 3975911. The next prime is 3975947. The reversal of 3975921 is 1295793.

It is not a de Polignac number, because 3975921 - 2⁶ = 3975857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3975911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11455 + ... + 11796.

Almost surely, 2^3975921 is an apocalyptic number.

It is an amenable number.

3975921 is a deficient number, since it is larger than the sum of its proper divisors (2069599).

3975921 is a wasteful number, since it uses less digits than its factorization.

3975921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23276 (or 23273 counting only the distinct ones).

The product of its digits is 17010, while the sum is 36.

The square root of 3975921 is about 1993.9711632820. The cubic root of 3975921 is about 158.4209386538.

The spelling of 3975921 in words is "three million, nine hundred seventy-five thousand, nine hundred twenty-one".