80001999 has 80 divisors (see below), whose sum is σ = 151658496. Its totient is φ = 40824000.

The previous prime is 80001959. The next prime is 80002001. The reversal of 80001999 is 99910008.

It is not a de Polignac number, because 80001999 - 2⁷ = 80001871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80001959) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 629874 + ... + 630000.

Almost surely, 2^80001999 is an apocalyptic number.

80001999 is a deficient number, since it is larger than the sum of its proper divisors (71656497).

80001999 is a wasteful number, since it uses less digits than its factorization.

80001999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258 (or 249 counting only the distinct ones).

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

The square root of 80001999 is about 8944.3836567983. The cubic root of 80001999 is about 430.8905269056.

It can be divided in two parts, 8000 and 1999, that added together give a palindrome (9999).

The spelling of 80001999 in words is "eighty million, one thousand, nine hundred ninety-nine".