3911621 has 6 divisors (see below), whose sum is σ = 4550310. Its totient is φ = 3352776.

The previous prime is 3911617. The next prime is 3911623. The reversal of 3911621 is 1261193.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 3441025 + 470596 = 1855^2 + 686^2 .

It is not a de Polignac number, because 3911621 - 2² = 3911617 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3911623) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39866 + ... + 39963.

It is an arithmetic number, because the mean of its divisors is an integer number (758385).

Almost surely, 2^3911621 is an apocalyptic number.

It is an amenable number.

3911621 is a deficient number, since it is larger than the sum of its proper divisors (638689).

3911621 is an equidigital number, since it uses as much as digits as its factorization.

3911621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79843 (or 79836 counting only the distinct ones).

The product of its digits is 324, while the sum is 23.

The square root of 3911621 is about 1977.7818383229. The cubic root of 3911621 is about 157.5622798963.

The spelling of 3911621 in words is "three million, nine hundred eleven thousand, six hundred twenty-one".