3958661 has 6 divisors (see below), whose sum is σ = 4605030. Its totient is φ = 3393096.

The previous prime is 3958657. The next prime is 3958687. The reversal of 3958661 is 1668593.

It can be written as a sum of positive squares in only one way, i.e., 2592100 + 1366561 = 1610^2 + 1169^2 .

It is not a de Polignac number, because 3958661 - 2² = 3958657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3958601) 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, 40346 + ... + 40443.

It is an arithmetic number, because the mean of its divisors is an integer number (767505).

Almost surely, 2^3958661 is an apocalyptic number.

It is an amenable number.

3958661 is a deficient number, since it is larger than the sum of its proper divisors (646369).

3958661 is an equidigital number, since it uses as much as digits as its factorization.

3958661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80803 (or 80796 counting only the distinct ones).

The product of its digits is 38880, while the sum is 38.

The square root of 3958661 is about 1989.6384093599. The cubic root of 3958661 is about 158.1913640312.

The spelling of 3958661 in words is "three million, nine hundred fifty-eight thousand, six hundred sixty-one".