3905989 has 4 divisors (see below), whose sum is σ = 3923424. Its totient is φ = 3888556.

The previous prime is 3905987. The next prime is 3905999. The reversal of 3905989 is 9895093.

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: 9895093 = 13 ⋅761161.

It is a cyclic number.

It is not a de Polignac number, because 3905989 - 2¹ = 3905987 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 (3905987) 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 3 ways as a sum of consecutive naturals, for example, 8377 + ... + 8830.

It is an arithmetic number, because the mean of its divisors is an integer number (980856).

Almost surely, 2^3905989 is an apocalyptic number.

It is an amenable number.

3905989 is a deficient number, since it is larger than the sum of its proper divisors (17435).

3905989 is a wasteful number, since it uses less digits than its factorization.

3905989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17434.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 3905989 is about 1976.3575081447. The cubic root of 3905989 is about 157.4866235385.

The spelling of 3905989 in words is "three million, nine hundred five thousand, nine hundred eighty-nine".