1920789265 has 8 divisors (see below), whose sum is σ = 2308837608. Its totient is φ = 1534037760.

The previous prime is 1920789263. The next prime is 1920789281. The reversal of 1920789265 is 5629870291.

It can be written as a sum of positive squares in 4 ways, for example, as 210801361 + 1709987904 = 14519^2 + 41352^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1920789265 - 2¹ = 1920789263 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1920789263) 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 7 ways as a sum of consecutive naturals, for example, 320946 + ... + 326875.

It is an arithmetic number, because the mean of its divisors is an integer number (288604701).

Almost surely, 2^1920789265 is an apocalyptic number.

It is an amenable number.

1920789265 is a deficient number, since it is larger than the sum of its proper divisors (388048343).

1920789265 is an equidigital number, since it uses as much as digits as its factorization.

1920789265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648419.

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 1920789265 is about 43826.8098884690. The cubic root of 1920789265 is about 1243.0632866799.

The spelling of 1920789265 in words is "one billion, nine hundred twenty million, seven hundred eighty-nine thousand, two hundred sixty-five".