1042728891 has 4 divisors (see below), whose sum is σ = 1390305192. Its totient is φ = 695152592.

The previous prime is 1042728871. The next prime is 1042728919. The reversal of 1042728891 is 1988272401.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1988272401 = 3 ⋅662757467.

It is a cyclic number.

It is not a de Polignac number, because 1042728891 - 2⁷ = 1042728763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1042728811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173788146 + ... + 173788151.

It is an arithmetic number, because the mean of its divisors is an integer number (347576298).

Almost surely, 2^1042728891 is an apocalyptic number.

1042728891 is a deficient number, since it is larger than the sum of its proper divisors (347576301).

1042728891 is an equidigital number, since it uses as much as digits as its factorization.

1042728891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347576300.

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 1042728891 is about 32291.3129339765. The cubic root of 1042728891 is about 1014.0447842301.

The spelling of 1042728891 in words is "one billion, forty-two million, seven hundred twenty-eight thousand, eight hundred ninety-one".