3999995 has 4 divisors (see below), whose sum is σ = 4800000. Its totient is φ = 3199992.

The previous prime is 3999971. The next prime is 4000037. The reversal of 3999995 is 5999993.

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 3999995 - 2⁸ = 3999739 is a prime.

It is an unprimeable number.

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, 399995 + ... + 400004.

It is an arithmetic number, because the mean of its divisors is an integer number (1200000).

Almost surely, 2^3999995 is an apocalyptic number.

3999995 is a deficient number, since it is larger than the sum of its proper divisors (800005).

3999995 is an equidigital number, since it uses as much as digits as its factorization.

3999995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800004.

The product of its digits is 885735, while the sum is 53.

The square root of 3999995 is about 1999.9987499996. The cubic root of 3999995 is about 158.7400390551.

It can be divided in two parts, 399999 and 5, that added together give a palindrome (400004).

The spelling of 3999995 in words is "three million, nine hundred ninety-nine thousand, nine hundred ninety-five".