2787989 has 4 divisors (see below), whose sum is σ = 2823360. Its totient is φ = 2752620.

The previous prime is 2787977. The next prime is 2788007. The reversal of 2787989 is 9897872.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2787989 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 (2787919) 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, 17567 + ... + 17724.

It is an arithmetic number, because the mean of its divisors is an integer number (705840).

2^2787989 is an apocalyptic number.

It is an amenable number.

2787989 is a deficient number, since it is larger than the sum of its proper divisors (35371).

2787989 is an equidigital number, since it uses as much as digits as its factorization.

2787989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35370.

The product of its digits is 508032, while the sum is 50.

The square root of 2787989 is about 1669.7272232314. The cubic root of 2787989 is about 140.7441498157.

The spelling of 2787989 in words is "two million, seven hundred eighty-seven thousand, nine hundred eighty-nine".