8001999 has 48 divisors (see below), whose sum is σ = 13178880. Its totient is φ = 4656960.

The previous prime is 8001991. The next prime is 8002003. The reversal of 8001999 is 9991008.

It is not a de Polignac number, because 8001999 - 2³ = 8001991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8001991) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 186072 + ... + 186114.

It is an arithmetic number, because the mean of its divisors is an integer number (274560).

Almost surely, 2^8001999 is an apocalyptic number.

8001999 is a deficient number, since it is larger than the sum of its proper divisors (5176881).

8001999 is a wasteful number, since it uses less digits than its factorization.

8001999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 129 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 8001999 is about 2828.7804792879. The cubic root of 8001999 is about 200.0166569460.

The spelling of 8001999 in words is "eight million, one thousand, nine hundred ninety-nine".