1287140 has 24 divisors (see below), whose sum is σ = 2728320. Its totient is φ = 510048.

The previous prime is 1287133. The next prime is 1287157. The reversal of 1287140 is 417821.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2549 + ... + 3011.

It is an arithmetic number, because the mean of its divisors is an integer number (113680).

2^1287140 is an apocalyptic number.

1287140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1287140 is an abundant number, since it is smaller than the sum of its proper divisors (1441180).

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

1287140 is a wasteful number, since it uses less digits than its factorization.

1287140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611 (or 609 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 1287140 is about 1134.5219257467. The cubic root of 1287140 is about 108.7782152534.

The spelling of 1287140 in words is "one million, two hundred eighty-seven thousand, one hundred forty".