2787245 has 4 divisors (see below), whose sum is σ = 3344700. Its totient is φ = 2229792.

The previous prime is 2787233. The next prime is 2787251. The reversal of 2787245 is 5427872.

2787245 is an esthetic number in base 13, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1378276 + 1408969 = 1174^2 + 1187^2 .

It is a cyclic number.

It is not a de Polignac number, because 2787245 - 2⁴ = 2787229 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278720 + ... + 278729.

It is an arithmetic number, because the mean of its divisors is an integer number (836175).

2^2787245 is an apocalyptic number.

It is an amenable number.

2787245 is a deficient number, since it is larger than the sum of its proper divisors (557455).

2787245 is an equidigital number, since it uses as much as digits as its factorization.

2787245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557454.

The product of its digits is 31360, while the sum is 35.

The square root of 2787245 is about 1669.5044174844. The cubic root of 2787245 is about 140.7316290868.

The spelling of 2787245 in words is "two million, seven hundred eighty-seven thousand, two hundred forty-five".