1288530 has 48 divisors (see below), whose sum is σ = 3407040. Its totient is φ = 337824.

The previous prime is 1288519. The next prime is 1288531. The reversal of 1288530 is 358821.

It is a happy number.

1288530 is a `hidden beast` number, since 128 + 8 + 530 = 666.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1288494 and 1288503.

It is not an unprimeable number, because it can be changed into a prime (1288531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9201 + ... + 9339.

It is an arithmetic number, because the mean of its divisors is an integer number (70980).

2^1288530 is an apocalyptic number.

1288530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1288530 is the 927-th pentagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1288530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1703520).

1288530 is an abundant number, since it is smaller than the sum of its proper divisors (2118510).

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

1288530 is a wasteful number, since it uses less digits than its factorization.

1288530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 1288530 is about 1135.1343532816. The cubic root of 1288530 is about 108.8173581914.

The spelling of 1288530 in words is "one million, two hundred eighty-eight thousand, five hundred thirty".