1287870 has 16 divisors (see below), whose sum is σ = 3090960. Its totient is φ = 343424.

The previous prime is 1287857. The next prime is 1287883. The reversal of 1287870 is 787821.

It is an interprime number because it is at equal distance from previous prime (1287857) and next prime (1287883).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 21435 + ... + 21494.

It is an arithmetic number, because the mean of its divisors is an integer number (193185).

2^1287870 is an apocalyptic number.

1287870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1287870 is an abundant number, since it is smaller than the sum of its proper divisors (1803090).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1287870 is a wasteful number, since it uses less digits than its factorization.

1287870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42939.

The product of its (nonzero) digits is 6272, while the sum is 33.

The square root of 1287870 is about 1134.8436015593. The cubic root of 1287870 is about 108.7987758477.

The spelling of 1287870 in words is "one million, two hundred eighty-seven thousand, eight hundred seventy".