2687947 has 4 divisors (see below), whose sum is σ = 2713176. Its totient is φ = 2662720.

The previous prime is 2687899. The next prime is 2687953. The reversal of 2687947 is 7497862.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2687947 is a prime.

It is a d-powerful number, because it can be written as 2⁷ + 6⁷ + 8⁷ + 7⁶ + 9⁵ + 4⁷ + 7⁶ .

It is a Duffinian number.

2687947 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2687957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12454 + ... + 12667.

It is an arithmetic number, because the mean of its divisors is an integer number (678294).

2^2687947 is an apocalyptic number.

2687947 is a deficient number, since it is larger than the sum of its proper divisors (25229).

2687947 is a wasteful number, since it uses less digits than its factorization.

2687947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25228.

The product of its digits is 169344, while the sum is 43.

The square root of 2687947 is about 1639.4959591289. The cubic root of 2687947 is about 139.0401519531.

The spelling of 2687947 in words is "two million, six hundred eighty-seven thousand, nine hundred forty-seven".