1040299985 has 4 divisors (see below), whose sum is σ = 1248359988. Its totient is φ = 832239984.

The previous prime is 1040299979. The next prime is 1040299987. The reversal of 1040299985 is 5899920401.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5899920401 = 107 ⋅55139443.

It can be written as a sum of positive squares in 2 ways, for example, as 285204544 + 755095441 = 16888^2 + 27479^2 .

It is a cyclic number.

It is not a de Polignac number, because 1040299985 - 2⁴ = 1040299969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1040299987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104029994 + ... + 104030003.

It is an arithmetic number, because the mean of its divisors is an integer number (312089997).

Almost surely, 2^1040299985 is an apocalyptic number.

It is an amenable number.

1040299985 is a deficient number, since it is larger than the sum of its proper divisors (208060003).

1040299985 is an equidigital number, since it uses as much as digits as its factorization.

1040299985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208060002.

The product of its (nonzero) digits is 233280, while the sum is 47.

The square root of 1040299985 is about 32253.6817278276. The cubic root of 1040299985 is about 1013.2568087579.

The spelling of 1040299985 in words is "one billion, forty million, two hundred ninety-nine thousand, nine hundred eighty-five".