1042842805 has 8 divisors (see below), whose sum is σ = 1259811000. Its totient is φ = 828674496.

The previous prime is 1042842803. The next prime is 1042842809. The reversal of 1042842805 is 5082482401.

It can be written as a sum of positive squares in 4 ways, for example, as 26635921 + 1016206884 = 5161^2 + 31878^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1042842805 - 2¹ = 1042842803 is a prime.

It is a super-2 number, since 2×1042842805² = 2175042231880536050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1042842803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 699150 + ... + 700639.

It is an arithmetic number, because the mean of its divisors is an integer number (157476375).

Almost surely, 2^1042842805 is an apocalyptic number.

It is an amenable number.

1042842805 is a deficient number, since it is larger than the sum of its proper divisors (216968195).

1042842805 is a wasteful number, since it uses less digits than its factorization.

1042842805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1399943.

The product of its (nonzero) digits is 20480, while the sum is 34.

The square root of 1042842805 is about 32293.0767348049. The cubic root of 1042842805 is about 1014.0817096772.

The spelling of 1042842805 in words is "one billion, forty-two million, eight hundred forty-two thousand, eight hundred five".