2027781 has 16 divisors (see below), whose sum is σ = 3433600. Its totient is φ = 1158624.

The previous prime is 2027759. The next prime is 2027783. The reversal of 2027781 is 1877202.

It is not a de Polignac number, because 2027781 - 2⁹ = 2027269 is a prime.

It is a super-2 number, since 2×2027781² = 8223791567922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2027783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5176 + ... + 5553.

It is an arithmetic number, because the mean of its divisors is an integer number (214600).

2^2027781 is an apocalyptic number.

2027781 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2027781 is a deficient number, since it is larger than the sum of its proper divisors (1405819).

2027781 is a wasteful number, since it uses less digits than its factorization.

2027781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10745 (or 10739 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 2027781 is about 1424.0017556169. The cubic root of 2027781 is about 126.5727890126.

The spelling of 2027781 in words is "two million, twenty-seven thousand, seven hundred eighty-one".