3912021 has 12 divisors (see below), whose sum is σ = 5667948. Its totient is φ = 2600064.

The previous prime is 3912017. The next prime is 3912031. The reversal of 3912021 is 1202193.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3294225 + 617796 = 1815^2 + 786^2 .

It is not a de Polignac number, because 3912021 - 2² = 3912017 is a prime.

3912021 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3911985 and 3912003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3912031) 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, 4971 + ... + 5703.

It is an arithmetic number, because the mean of its divisors is an integer number (472329).

Almost surely, 2^3912021 is an apocalyptic number.

It is an amenable number.

3912021 is a deficient number, since it is larger than the sum of its proper divisors (1755927).

3912021 is a wasteful number, since it uses less digits than its factorization.

3912021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332 (or 1329 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 3912021 is about 1977.8829591257. The cubic root of 3912021 is about 157.5676504544.

The spelling of 3912021 in words is "three million, nine hundred twelve thousand, twenty-one".