2781245 has 8 divisors (see below), whose sum is σ = 3452760. Its totient is φ = 2148160.

The previous prime is 2781221. The next prime is 2781271. The reversal of 2781245 is 5421872.

2781245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 573049 + 2208196 = 757^2 + 1486^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2781245 - 2¹² = 2777149 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9446 + ... + 9735.

It is an arithmetic number, because the mean of its divisors is an integer number (431595).

2^2781245 is an apocalyptic number.

It is an amenable number.

2781245 is a deficient number, since it is larger than the sum of its proper divisors (671515).

2781245 is a wasteful number, since it uses less digits than its factorization.

2781245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19215.

The product of its digits is 4480, while the sum is 29.

The square root of 2781245 is about 1667.7065089517. The cubic root of 2781245 is about 140.6305739354.

The spelling of 2781245 in words is "two million, seven hundred eighty-one thousand, two hundred forty-five".