1940436009 has 54 divisors (see below), whose sum is σ = 3095080170. Its totient is φ = 1171215936.

The previous prime is 1940435993. The next prime is 1940436011. The reversal of 1940436009 is 9006340491.

1940436009 is a `hidden beast` number, since 1 + 9 + 4 + 0 + 43 + 600 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1252947609 + 687488400 = 35397^2 + 26220^2 .

It is not a de Polignac number, because 1940436009 - 2⁴ = 1940435993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1940436709) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 1718157 + ... + 1719285.

Almost surely, 2^1940436009 is an apocalyptic number.

1940436009 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1940436009 is a deficient number, since it is larger than the sum of its proper divisors (1154644161).

1940436009 is a wasteful number, since it uses less digits than its factorization.

1940436009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219 (or 1174 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 1940436009 is about 44050.3803502308. The cubic root of 1940436009 is about 1247.2871317896.

The spelling of 1940436009 in words is "one billion, nine hundred forty million, four hundred thirty-six thousand, nine".