1299987 has 24 divisors (see below), whose sum is σ = 2079168. Its totient is φ = 777600.

The previous prime is 1299979. The next prime is 1299989. The reversal of 1299987 is 7899921.

It is not a de Polignac number, because 1299987 - 2³ = 1299979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1299989) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 4662 + ... + 4932.

It is an arithmetic number, because the mean of its divisors is an integer number (86632).

2^1299987 is an apocalyptic number.

1299987 is a deficient number, since it is larger than the sum of its proper divisors (779181).

1299987 is a wasteful number, since it uses less digits than its factorization.

1299987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331 (or 328 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 1299987 is about 1140.1697242078. The cubic root of 1299987 is about 109.1389245073.

It can be divided in two parts, 12 and 99987, that added together give a palindrome (99999).

The spelling of 1299987 in words is "one million, two hundred ninety-nine thousand, nine hundred eighty-seven".