1920378711 has 4 divisors (see below), whose sum is σ = 2560504952. Its totient is φ = 1280252472.

The previous prime is 1920378703. The next prime is 1920378737. The reversal of 1920378711 is 1178730291.

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

It is not a de Polignac number, because 1920378711 - 2³ = 1920378703 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1920378711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1920378211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320063116 + ... + 320063121.

It is an arithmetic number, because the mean of its divisors is an integer number (640126238).

Almost surely, 2^1920378711 is an apocalyptic number.

1920378711 is a deficient number, since it is larger than the sum of its proper divisors (640126241).

1920378711 is an equidigital number, since it uses as much as digits as its factorization.

1920378711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640126240.

The product of its (nonzero) digits is 21168, while the sum is 39.

The square root of 1920378711 is about 43822.1258156197. The cubic root of 1920378711 is about 1242.9747152822.

The spelling of 1920378711 in words is "one billion, nine hundred twenty million, three hundred seventy-eight thousand, seven hundred eleven".