2789999 has 4 divisors (see below), whose sum is σ = 2798760. Its totient is φ = 2781240.

The previous prime is 2789993. The next prime is 2790001. The reversal of 2789999 is 9999872.

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 2789999 - 2¹² = 2785903 is a prime.

It is a Duffinian number.

2789999 is a modest number, since divided by 9999 gives 278 as remainder.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 2789999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2789993) 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, 3884 + ... + 4545.

It is an arithmetic number, because the mean of its divisors is an integer number (699690).

2^2789999 is an apocalyptic number.

2789999 is a deficient number, since it is larger than the sum of its proper divisors (8761).

2789999 is an equidigital number, since it uses as much as digits as its factorization.

2789999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8760.

The product of its digits is 734832, while the sum is 53.

The square root of 2789999 is about 1670.3290095068. The cubic root of 2789999 is about 140.7779648443. Note that the first 3 decimals are identical.

The spelling of 2789999 in words is "two million, seven hundred eighty-nine thousand, nine hundred ninety-nine".