1288420 has 24 divisors (see below), whose sum is σ = 3092544. Its totient is φ = 441696.

The previous prime is 1288393. The next prime is 1288421. The reversal of 1288420 is 248821.

It is not an unprimeable number, because it can be changed into a prime (1288421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4462 + ... + 4741.

It is an arithmetic number, because the mean of its divisors is an integer number (128856).

2^1288420 is an apocalyptic number.

1288420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1288420 is an abundant number, since it is smaller than the sum of its proper divisors (1804124).

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

1288420 is a wasteful number, since it uses less digits than its factorization.

1288420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9219 (or 9217 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 1288420 is about 1135.0858998331. The cubic root of 1288420 is about 108.8142615749.

The spelling of 1288420 in words is "one million, two hundred eighty-eight thousand, four hundred twenty".