2780001 has 20 divisors (see below), whose sum is σ = 4747072. Its totient is φ = 1588248.

The previous prime is 2779991. The next prime is 2780039. The reversal of 2780001 is 1000872.

2780001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2780001 - 2⁷ = 2779873 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 (2780101) 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 19 ways as a sum of consecutive naturals, for example, 1885 + ... + 3018.

2^2780001 is an apocalyptic number.

2780001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2780001 is a deficient number, since it is larger than the sum of its proper divisors (1967071).

2780001 is an equidigital number, since it uses as much as digits as its factorization.

2780001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4922 (or 4913 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 2780001 is about 1667.3334999334. Note that the first 3 decimals coincide. The cubic root of 2780001 is about 140.6096036477.

Adding to 2780001 its reverse (1000872), we get a palindrome (3780873).

The spelling of 2780001 in words is "two million, seven hundred eighty thousand, one".