1278987 has 16 divisors (see below), whose sum is σ = 1800480. Its totient is φ = 806400.

The previous prime is 1278983. The next prime is 1278997. The reversal of 1278987 is 7898721.

It is not a de Polignac number, because 1278987 - 2² = 1278983 is a prime.

It is an alternating number because its digits alternate between odd and even.

1278987 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1278983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5187 + ... + 5427.

It is an arithmetic number, because the mean of its divisors is an integer number (112530).

2^1278987 is an apocalyptic number.

1278987 is a deficient number, since it is larger than the sum of its proper divisors (521493).

1278987 is a wasteful number, since it uses less digits than its factorization.

1278987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334.

The product of its digits is 56448, while the sum is 42.

The square root of 1278987 is about 1130.9230743070. The cubic root of 1278987 is about 108.5480543436.

The spelling of 1278987 in words is "one million, two hundred seventy-eight thousand, nine hundred eighty-seven".