4099989 has 4 divisors (see below), whose sum is σ = 5466656. Its totient is φ = 2733324.

The previous prime is 4099981. The next prime is 4100011. The reversal of 4099989 is 9899904.

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 not a de Polignac number, because 4099989 - 2³ = 4099981 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

4099989 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4099981) 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, 683329 + ... + 683334.

It is an arithmetic number, because the mean of its divisors is an integer number (1366664).

Almost surely, 2^4099989 is an apocalyptic number.

It is an amenable number.

4099989 is a deficient number, since it is larger than the sum of its proper divisors (1366667).

4099989 is a wasteful number, since it uses less digits than its factorization.

4099989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366666.

The product of its (nonzero) digits is 209952, while the sum is 48.

The square root of 4099989 is about 2024.8429568734. The cubic root of 4099989 is about 160.0519232522.

The spelling of 4099989 in words is "four million, ninety-nine thousand, nine hundred eighty-nine".