2777989 has 4 divisors (see below), whose sum is σ = 2781324. Its totient is φ = 2774656.

The previous prime is 2777981. The next prime is 2777993. The reversal of 2777989 is 9897772.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1361889 + 1416100 = 1167^2 + 1190^2 .

It is a cyclic number.

It is not a de Polignac number, because 2777989 - 2³ = 2777981 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 (2777981) 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, 789 + ... + 2485.

It is an arithmetic number, because the mean of its divisors is an integer number (695331).

2^2777989 is an apocalyptic number.

It is an amenable number.

2777989 is a deficient number, since it is larger than the sum of its proper divisors (3335).

2777989 is a wasteful number, since it uses less digits than its factorization.

2777989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3334.

The product of its digits is 444528, while the sum is 49.

The square root of 2777989 is about 1666.7300321288. The cubic root of 2777989 is about 140.5756738278.

The spelling of 2777989 in words is "two million, seven hundred seventy-seven thousand, nine hundred eighty-nine".