1288830 has 16 divisors (see below), whose sum is σ = 3093264. Its totient is φ = 343680.

The previous prime is 1288829. The next prime is 1288831. The reversal of 1288830 is 388821.

It is an interprime number because it is at equal distance from previous prime (1288829) and next prime (1288831).

It is a super-2 number, since 2×1288830² = 3322165537800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 42961 = 1288830 / (1 + 2 + 8 + 8 + 8 + 3 + 0).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21451 + ... + 21510.

It is an arithmetic number, because the mean of its divisors is an integer number (193329).

2^1288830 is an apocalyptic number.

1288830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1288830 is an abundant number, since it is smaller than the sum of its proper divisors (1804434).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1288830 is a wasteful number, since it uses less digits than its factorization.

1288830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42971.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 1288830 is about 1135.2664885391. The cubic root of 1288830 is about 108.8258026137.

Subtracting from 1288830 its reverse (388821), we obtain a palindrome (900009).

The spelling of 1288830 in words is "one million, two hundred eighty-eight thousand, eight hundred thirty".