1288140 has 48 divisors (see below), whose sum is σ = 4123392. Its totient is φ = 294336.

The previous prime is 1288117. The next prime is 1288163. The reversal of 1288140 is 418821.

It is an interprime number because it is at equal distance from previous prime (1288117) and next prime (1288163).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1288140.

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, 1114 + ... + 1953.

It is an arithmetic number, because the mean of its divisors is an integer number (85904).

2^1288140 is an apocalyptic number.

1288140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1288140 is an abundant number, since it is smaller than the sum of its proper divisors (2835252).

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

1288140 is a wasteful number, since it uses less digits than its factorization.

1288140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3086 (or 3084 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 1288140 is about 1134.9625544484. The cubic root of 1288140 is about 108.8063784827.

It can be divided in two parts, 12881 and 40, that added together give a palindrome (12921).

The spelling of 1288140 in words is "one million, two hundred eighty-eight thousand, one hundred forty".