1288440 has 64 divisors (see below), whose sum is σ = 4298400. Its totient is φ = 343296.

The previous prime is 1288439. The next prime is 1288487. The reversal of 1288440 is 448821.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 484 + ... + 1676.

2^1288440 is an apocalyptic number.

1288440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1288440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2149200).

1288440 is an abundant number, since it is smaller than the sum of its proper divisors (3009960).

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

1288440 is a wasteful number, since it uses less digits than its factorization.

1288440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213 (or 1203 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 1288440 is about 1135.0947097049. The cubic root of 1288440 is about 108.8148246092.

It can be divided in two parts, 1288 and 440, that added together give a cube (1728 = 12³).

The spelling of 1288440 in words is "one million, two hundred eighty-eight thousand, four hundred forty".