1581242 has 16 divisors (see below), whose sum is σ = 2598792. Its totient is φ = 717120.

The previous prime is 1581211. The next prime is 1581257. The reversal of 1581242 is 2421851.

It can be written as a sum of positive squares in 4 ways, for example, as 942841 + 638401 = 971^2 + 799^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1088 + ... + 2084.

2^1581242 is an apocalyptic number.

1581242 is a deficient number, since it is larger than the sum of its proper divisors (1017550).

1581242 is a wasteful number, since it uses less digits than its factorization.

1581242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073.

The product of its digits is 640, while the sum is 23.

The square root of 1581242 is about 1257.4744530208. The cubic root of 1581242 is about 116.5018388948.

The spelling of 1581242 in words is "one million, five hundred eighty-one thousand, two hundred forty-two".