1287345 has 16 divisors (see below), whose sum is σ = 2168640. Its totient is φ = 650304.

The previous prime is 1287343. The next prime is 1287347. The reversal of 1287345 is 5437821.

It is an interprime number because it is at equal distance from previous prime (1287343) and next prime (1287347).

It is not a de Polignac number, because 1287345 - 2¹ = 1287343 is a prime.

1287345 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287343) 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, 1974 + ... + 2543.

It is an arithmetic number, because the mean of its divisors is an integer number (135540).

2^1287345 is an apocalyptic number.

1287345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1287345 is a deficient number, since it is larger than the sum of its proper divisors (881295).

1287345 is a wasteful number, since it uses less digits than its factorization.

1287345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4544.

The product of its digits is 6720, while the sum is 30.

The square root of 1287345 is about 1134.6122685746. The cubic root of 1287345 is about 108.7839899038.

The spelling of 1287345 in words is "one million, two hundred eighty-seven thousand, three hundred forty-five".