1288889 has 8 divisors (see below), whose sum is σ = 1559808. Its totient is φ = 1039680.

The previous prime is 1288877. The next prime is 1288891. The reversal of 1288889 is 9888821.

1288889 is nontrivially palindromic in base 2.

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 1288889 - 2⁴ = 1288873 is a prime.

It is a super-2 number, since 2×1288889² = 3322469708642, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1288829) 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, 5297 + ... + 5534.

It is an arithmetic number, because the mean of its divisors is an integer number (194976).

2^1288889 is an apocalyptic number.

It is an amenable number.

1288889 is a deficient number, since it is larger than the sum of its proper divisors (270919).

1288889 is a wasteful number, since it uses less digits than its factorization.

1288889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10855.

The product of its digits is 73728, while the sum is 44.

The square root of 1288889 is about 1135.2924733301. The cubic root of 1288889 is about 108.8274631959.

The spelling of 1288889 in words is "one million, two hundred eighty-eight thousand, eight hundred eighty-nine".