3899999 has 4 divisors (see below), whose sum is σ = 3914160. Its totient is φ = 3885840.

The previous prime is 3899989. The next prime is 3900067. The reversal of 3899999 is 9999983.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3899999 - 2⁴ = 3899983 is a prime.

It is a Duffinian number.

3899999 is a modest number, since divided by 9999 gives 389 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3899989) 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, 6659 + ... + 7220.

It is an arithmetic number, because the mean of its divisors is an integer number (978540).

Almost surely, 2^3899999 is an apocalyptic number.

3899999 is a deficient number, since it is larger than the sum of its proper divisors (14161).

3899999 is a wasteful number, since it uses less digits than its factorization.

3899999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14160.

The product of its digits is 1417176, while the sum is 56.

The square root of 3899999 is about 1974.8415126283. The cubic root of 3899999 is about 157.4060782096.

The spelling of 3899999 in words is "three million, eight hundred ninety-nine thousand, nine hundred ninety-nine".