1042685809 has 8 divisors (see below), whose sum is σ = 1137737952. Its totient is φ = 947677440.

The previous prime is 1042685771. The next prime is 1042685821. The reversal of 1042685809 is 9085862401.

It is a happy number.

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 1042685809 - 2⁷ = 1042685681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1042685849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57522 + ... + 73444.

It is an arithmetic number, because the mean of its divisors is an integer number (142217244).

Almost surely, 2^1042685809 is an apocalyptic number.

It is an amenable number.

1042685809 is a deficient number, since it is larger than the sum of its proper divisors (95052143).

1042685809 is a wasteful number, since it uses less digits than its factorization.

1042685809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21887.

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 1042685809 is about 32290.6458436495. The cubic root of 1042685809 is about 1014.0308184142.

The spelling of 1042685809 in words is "one billion, forty-two million, six hundred eighty-five thousand, eight hundred nine".