3989805 has 8 divisors (see below), whose sum is σ = 6383712. Its totient is φ = 2127888.

The previous prime is 3989801. The next prime is 3989807. The reversal of 3989805 is 5089893.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3989805 - 2² = 3989801 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3989801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132979 + ... + 133008.

It is an arithmetic number, because the mean of its divisors is an integer number (797964).

Almost surely, 2^3989805 is an apocalyptic number.

It is an amenable number.

3989805 is a deficient number, since it is larger than the sum of its proper divisors (2393907).

3989805 is a wasteful number, since it uses less digits than its factorization.

3989805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265995.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 3989805 is about 1997.4496238954. The cubic root of 3989805 is about 158.6051275093.

The spelling of 3989805 in words is "three million, nine hundred eighty-nine thousand, eight hundred five".