1287715 has 16 divisors (see below), whose sum is σ = 1816416. Its totient is φ = 864000.

The previous prime is 1287707. The next prime is 1287731. The reversal of 1287715 is 5177821.

1287715 = T₃₃ + T₃₄ + ... + T₁₉₇.

1287715 = 88² + 89² + ... + 165².

It is a happy number.

It is not a de Polignac number, because 1287715 - 2³ = 1287707 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186 + ... + 1615.

It is an arithmetic number, because the mean of its divisors is an integer number (113526).

2^1287715 is an apocalyptic number.

1287715 is a deficient number, since it is larger than the sum of its proper divisors (528701).

1287715 is a wasteful number, since it uses less digits than its factorization.

1287715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1830.

The product of its digits is 3920, while the sum is 31.

The square root of 1287715 is about 1134.7753081558. The cubic root of 1287715 is about 108.7944108919.

It can be divided in two parts, 1287 and 715, that added together give a palindrome (2002).

The spelling of 1287715 in words is "one million, two hundred eighty-seven thousand, seven hundred fifteen".