1920534709 has 4 divisors (see below), whose sum is σ = 1931145580. Its totient is φ = 1909923840.

The previous prime is 1920534697. The next prime is 1920534739. The reversal of 1920534709 is 9074350291.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 286354084 + 1634180625 = 16922^2 + 40425^2 .

It is a cyclic number.

It is not a de Polignac number, because 1920534709 - 2⁵ = 1920534677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1920534739) 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, 5305164 + ... + 5305525.

It is an arithmetic number, because the mean of its divisors is an integer number (482786395).

Almost surely, 2^1920534709 is an apocalyptic number.

It is an amenable number.

1920534709 is a deficient number, since it is larger than the sum of its proper divisors (10610871).

1920534709 is a wasteful number, since it uses less digits than its factorization.

1920534709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10610870.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 1920534709 is about 43823.9056794348. The cubic root of 1920534709 is about 1243.0083711992.

The spelling of 1920534709 in words is "one billion, nine hundred twenty million, five hundred thirty-four thousand, seven hundred nine".