1940747809 has 16 divisors (see below), whose sum is σ = 2605760640. Its totient is φ = 1395941760.

The previous prime is 1940747779. The next prime is 1940747819. The reversal of 1940747809 is 9087470491.

It is a cyclic number.

It is not a de Polignac number, because 1940747809 - 2²³ = 1932359201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1940747819) 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 15 ways as a sum of consecutive naturals, for example, 968404 + ... + 970405.

It is an arithmetic number, because the mean of its divisors is an integer number (162860040).

Almost surely, 2^1940747809 is an apocalyptic number.

It is an amenable number.

1940747809 is a deficient number, since it is larger than the sum of its proper divisors (665012831).

1940747809 is a wasteful number, since it uses less digits than its factorization.

1940747809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1938840.

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 1940747809 is about 44053.9193375572. The cubic root of 1940747809 is about 1247.3539352120.

The spelling of 1940747809 in words is "one billion, nine hundred forty million, seven hundred forty-seven thousand, eight hundred nine".