1531280 has 20 divisors (see below), whose sum is σ = 3560412. Its totient is φ = 612480.

The previous prime is 1531279. The next prime is 1531297. The reversal of 1531280 is 821351.

It can be written as a sum of positive squares in 2 ways, for example, as 692224 + 839056 = 832^2 + 916^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9491 + ... + 9650.

2^1531280 is an apocalyptic number.

1531280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1531280 is an abundant number, since it is smaller than the sum of its proper divisors (2029132).

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

1531280 is a wasteful number, since it uses less digits than its factorization.

1531280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19154 (or 19148 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1531280 is about 1237.4489888476. The cubic root of 1531280 is about 115.2616600208.

The spelling of 1531280 in words is "one million, five hundred thirty-one thousand, two hundred eighty".