2781247 has 8 divisors (see below), whose sum is σ = 3217536. Its totient is φ = 2354712.

The previous prime is 2781221. The next prime is 2781271. The reversal of 2781247 is 7421872.

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

It is a cyclic number.

It is not a de Polignac number, because 2781247 - 2¹⁹ = 2256959 is a prime.

2781247 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2781347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1813 + ... + 2974.

It is an arithmetic number, because the mean of its divisors is an integer number (402192).

2^2781247 is an apocalyptic number.

2781247 is a deficient number, since it is larger than the sum of its proper divisors (436289).

2781247 is an equidigital number, since it uses as much as digits as its factorization.

2781247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4877.

The product of its digits is 6272, while the sum is 31.

The square root of 2781247 is about 1667.7071085775. The cubic root of 2781247 is about 140.6306076447.

The spelling of 2781247 in words is "two million, seven hundred eighty-one thousand, two hundred forty-seven".