799949999 has 4 divisors (see below), whose sum is σ = 801522120. Its totient is φ = 798377880.

The previous prime is 799949993. The next prime is 799950001. The reversal of 799949999 is 999949997.

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 799949999 - 2²⁰ = 798901423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (799949993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 785297 + ... + 786314.

It is an arithmetic number, because the mean of its divisors is an integer number (200380530).

Almost surely, 2^799949999 is an apocalyptic number.

799949999 is a deficient number, since it is larger than the sum of its proper divisors (1572121).

799949999 is a wasteful number, since it uses less digits than its factorization.

799949999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572120.

The product of its digits is 133923132, while the sum is 74.

The square root of 799949999 is about 28283.3873324961. The cubic root of 799949999 is about 928.2984259793.

It can be divided in two parts, 79994 and 9999, that multiplied together give a triangular number (799860006 = T₃₉₉₉₆).

The spelling of 799949999 in words is "seven hundred ninety-nine million, nine hundred forty-nine thousand, nine hundred ninety-nine".