3955809 has 16 divisors (see below), whose sum is σ = 6197184. Its totient is φ = 2212800.

The previous prime is 3955799. The next prime is 3955813. The reversal of 3955809 is 9085593.

3955809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3955809 - 2¹⁹ = 3431521 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (3955859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4182 + ... + 5039.

It is an arithmetic number, because the mean of its divisors is an integer number (387324).

Almost surely, 2^3955809 is an apocalyptic number.

3955809 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

3955809 is a deficient number, since it is larger than the sum of its proper divisors (2241375).

3955809 is a wasteful number, since it uses less digits than its factorization.

3955809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9248.

The product of its (nonzero) digits is 48600, while the sum is 39.

The square root of 3955809 is about 1988.9215670810. The cubic root of 3955809 is about 158.1533654790.

The spelling of 3955809 in words is "three million, nine hundred fifty-five thousand, eight hundred nine".