3989913 has 4 divisors (see below), whose sum is σ = 5319888. Its totient is φ = 2659940.

The previous prime is 3989903. The next prime is 3989929. The reversal of 3989913 is 3199893.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 3989913 - 2⁴ = 3989897 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (3989903) 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, 664983 + ... + 664988.

It is an arithmetic number, because the mean of its divisors is an integer number (1329972).

Almost surely, 2^3989913 is an apocalyptic number.

It is an amenable number.

3989913 is a deficient number, since it is larger than the sum of its proper divisors (1329975).

3989913 is a wasteful number, since it uses less digits than its factorization.

3989913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1329974.

The product of its digits is 52488, while the sum is 42.

The square root of 3989913 is about 1997.4766581865. The cubic root of 3989913 is about 158.6065585900.

The spelling of 3989913 in words is "three million, nine hundred eighty-nine thousand, nine hundred thirteen".