1288999 has 8 divisors (see below), whose sum is σ = 1335600. Its totient is φ = 1243200.

The previous prime is 1288997. The next prime is 1289003. The reversal of 1288999 is 9998821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1288999 - 2¹ = 1288997 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6004 + ... + 6214.

It is an arithmetic number, because the mean of its divisors is an integer number (166950).

2^1288999 is an apocalyptic number.

1288999 is a deficient number, since it is larger than the sum of its proper divisors (46601).

1288999 is a wasteful number, since it uses less digits than its factorization.

1288999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401.

The product of its digits is 93312, while the sum is 46.

The square root of 1288999 is about 1135.3409179625. The cubic root of 1288999 is about 108.8305590612.

The spelling of 1288999 in words is "one million, two hundred eighty-eight thousand, nine hundred ninety-nine".