1405280 has 24 divisors (see below), whose sum is σ = 3320352. Its totient is φ = 562048.

The previous prime is 1405267. The next prime is 1405289. The reversal of 1405280 is 825041.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1405289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4232 + ... + 4551.

It is an arithmetic number, because the mean of its divisors is an integer number (138348).

2^1405280 is an apocalyptic number.

1405280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1405280 is an abundant number, since it is smaller than the sum of its proper divisors (1915072).

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

1405280 is an equidigital number, since it uses as much as digits as its factorization.

1405280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8798 (or 8790 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1405280 is about 1185.4450641004. The cubic root of 1405280 is about 112.0093529604.

The spelling of 1405280 in words is "one million, four hundred five thousand, two hundred eighty".