1040785509 has 8 divisors (see below), whose sum is σ = 1469344320. Its totient is φ = 653041856.

The previous prime is 1040785463. The next prime is 1040785513. The reversal of 1040785509 is 9055870401.

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 1040785509 - 2⁷ = 1040785381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1040785609) 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, 10203729 + ... + 10203830.

It is an arithmetic number, because the mean of its divisors is an integer number (183668040).

Almost surely, 2^1040785509 is an apocalyptic number.

It is an amenable number.

1040785509 is a deficient number, since it is larger than the sum of its proper divisors (428558811).

1040785509 is a wasteful number, since it uses less digits than its factorization.

1040785509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20407579.

The product of its (nonzero) digits is 50400, while the sum is 39.

The square root of 1040785509 is about 32261.2074944507. The cubic root of 1040785509 is about 1013.4144184187.

The spelling of 1040785509 in words is "one billion, forty million, seven hundred eighty-five thousand, five hundred nine".