2780955 has 24 divisors (see below), whose sum is σ = 4988880. Its totient is φ = 1431360.

The previous prime is 2780951. The next prime is 2780971. The reversal of 2780955 is 5590872.

It is not a de Polignac number, because 2780955 - 2² = 2780951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2780951) 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 23 ways as a sum of consecutive naturals, for example, 240 + ... + 2370.

It is an arithmetic number, because the mean of its divisors is an integer number (207870).

2^2780955 is an apocalyptic number.

2780955 is a deficient number, since it is larger than the sum of its proper divisors (2207925).

2780955 is a wasteful number, since it uses less digits than its factorization.

2780955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2171 (or 2168 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 2780955 is about 1667.6195609311. The cubic root of 2780955 is about 140.6256859226.

The spelling of 2780955 in words is "two million, seven hundred eighty thousand, nine hundred fifty-five".