1287915 has 16 divisors (see below), whose sum is σ = 2169600. Its totient is φ = 650592.

The previous prime is 1287899. The next prime is 1287917. The reversal of 1287915 is 5197821.

It is not a de Polignac number, because 1287915 - 2⁴ = 1287899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1287917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1975 + ... + 2544.

It is an arithmetic number, because the mean of its divisors is an integer number (135600).

2^1287915 is an apocalyptic number.

1287915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1287915 is a deficient number, since it is larger than the sum of its proper divisors (881685).

1287915 is a wasteful number, since it uses less digits than its factorization.

1287915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4546.

The product of its digits is 5040, while the sum is 33.

The square root of 1287915 is about 1134.8634279066. The cubic root of 1287915 is about 108.8000430273.

The spelling of 1287915 in words is "one million, two hundred eighty-seven thousand, nine hundred fifteen".