3955661 has 4 divisors (see below), whose sum is σ = 4039872. Its totient is φ = 3871452.

The previous prime is 3955657. The next prime is 3955663. The reversal of 3955661 is 1665593.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1665593 = 461 ⋅3613.

It is a cyclic number.

It is not a de Polignac number, because 3955661 - 2² = 3955657 is a prime.

It is a d-powerful number, because it can be written as 3⁶ + 9³ + 5⁹ + 5⁹ + 6⁴ + 6⁶ + 1 .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3955663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42035 + ... + 42128.

It is an arithmetic number, because the mean of its divisors is an integer number (1009968).

Almost surely, 2^3955661 is an apocalyptic number.

It is an amenable number.

3955661 is a deficient number, since it is larger than the sum of its proper divisors (84211).

3955661 is an equidigital number, since it uses as much as digits as its factorization.

3955661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84210.

The product of its digits is 24300, while the sum is 35.

The square root of 3955661 is about 1988.8843606404. The cubic root of 3955661 is about 158.1513931062.

The spelling of 3955661 in words is "three million, nine hundred fifty-five thousand, six hundred sixty-one".