1288740 has 48 divisors (see below), whose sum is σ = 3693312. Its totient is φ = 335616.

The previous prime is 1288733. The next prime is 1288769. The reversal of 1288740 is 478821.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1288698 and 1288707.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2592 + ... + 3048.

It is an arithmetic number, because the mean of its divisors is an integer number (76944).

2^1288740 is an apocalyptic number.

1288740 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 1288740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1846656).

1288740 is an abundant number, since it is smaller than the sum of its proper divisors (2404572).

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

1288740 is a wasteful number, since it uses less digits than its factorization.

1288740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516 (or 514 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 1288740 is about 1135.2268495768. The cubic root of 1288740 is about 108.8232694246.

The spelling of 1288740 in words is "one million, two hundred eighty-eight thousand, seven hundred forty".