1920881265 has 16 divisors (see below), whose sum is σ = 3179390400. Its totient is φ = 989143232.

The previous prime is 1920881257. The next prime is 1920881267. The reversal of 1920881265 is 5621880291.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1920881265 - 2³ = 1920881257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1920881267) 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, 2207475 + ... + 2208344.

It is an arithmetic number, because the mean of its divisors is an integer number (198711900).

Almost surely, 2^1920881265 is an apocalyptic number.

1920881265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1920881265 is a deficient number, since it is larger than the sum of its proper divisors (1258509135).

1920881265 is a wasteful number, since it uses less digits than its factorization.

1920881265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4415856.

The product of its (nonzero) digits is 69120, while the sum is 42.

The square root of 1920881265 is about 43827.8594617624. The cubic root of 1920881265 is about 1243.0831326877.

The spelling of 1920881265 in words is "one billion, nine hundred twenty million, eight hundred eighty-one thousand, two hundred sixty-five".