8019999 has 32 divisors (see below), whose sum is σ = 13012160. Its totient is φ = 4852224.

The previous prime is 8019997. The next prime is 8020003. The reversal of 8019999 is 9999108.

8019999 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8019999 - 2¹ = 8019997 is a prime.

It is a Duffinian number.

8019999 is a modest number, since divided by 9999 gives 801 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8019997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25467 + ... + 25779.

It is an arithmetic number, because the mean of its divisors is an integer number (406630).

Almost surely, 2^8019999 is an apocalyptic number.

8019999 is a deficient number, since it is larger than the sum of its proper divisors (4992161).

8019999 is a wasteful number, since it uses less digits than its factorization.

8019999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408 (or 402 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 8019999 is about 2831.9602751451. The cubic root of 8019999 is about 200.1665196509.

The spelling of 8019999 in words is "eight million, nineteen thousand, nine hundred ninety-nine".