1581472 has 24 divisors (see below), whose sum is σ = 3160836. Its totient is φ = 778752.

The previous prime is 1581469. The next prime is 1581473. The reversal of 1581472 is 2741851.

It can be written as a sum of positive squares in 2 ways, for example, as 1354896 + 226576 = 1164^2 + 476^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1581472.

It is not an unprimeable number, because it can be changed into a prime (1581473) 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, 1998 + ... + 2674.

2^1581472 is an apocalyptic number.

It is an amenable number.

1581472 is a deficient number, since it is larger than the sum of its proper divisors (1579364).

1581472 is an equidigital number, since it uses as much as digits as its factorization.

1581472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760 (or 752 counting only the distinct ones).

The product of its digits is 2240, while the sum is 28.

The square root of 1581472 is about 1257.5659028457. The cubic root of 1581472 is about 116.5074872235.

The spelling of 1581472 in words is "one million, five hundred eighty-one thousand, four hundred seventy-two".