2775987 has 12 divisors (see below), whose sum is σ = 4108104. Its totient is φ = 1805280.

The previous prime is 2775959. The next prime is 2775989. The reversal of 2775987 is 7895772.

It is not a de Polignac number, because 2775987 - 2⁷ = 2775859 is a prime.

It is a super-2 number, since 2×2775987² = 15412207648338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2775989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3393 + ... + 4130.

It is an arithmetic number, because the mean of its divisors is an integer number (342342).

2^2775987 is an apocalyptic number.

2775987 is a deficient number, since it is larger than the sum of its proper divisors (1332117).

2775987 is a wasteful number, since it uses less digits than its factorization.

2775987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7570 (or 7567 counting only the distinct ones).

The product of its digits is 246960, while the sum is 45.

The square root of 2775987 is about 1666.1293467195. The cubic root of 2775987 is about 140.5418963803.

The spelling of 2775987 in words is "two million, seven hundred seventy-five thousand, nine hundred eighty-seven".