2781730 has 32 divisors (see below), whose sum is σ = 5846400. Its totient is φ = 952560.

The previous prime is 2781707. The next prime is 2781731. The reversal of 2781730 is 371872.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2781731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3025 + ... + 3835.

It is an arithmetic number, because the mean of its divisors is an integer number (182700).

2^2781730 is an apocalyptic number.

2781730 is an abundant number, since it is smaller than the sum of its proper divisors (3064670).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2781730 is an equidigital number, since it uses as much as digits as its factorization.

2781730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839 (or 825 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 2781730 is about 1667.8519118915. The cubic root of 2781730 is about 140.6387479563.

The spelling of 2781730 in words is "two million, seven hundred eighty-one thousand, seven hundred thirty".