1920421265 has 8 divisors (see below), whose sum is σ = 2633720640. Its totient is φ = 1316860272.

The previous prime is 1920421259. The next prime is 1920421289. The reversal of 1920421265 is 5621240291.

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

It is not a de Polignac number, because 1920421265 - 2¹⁸ = 1920159121 is a prime.

It is an unprimeable number.

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, 27434555 + ... + 27434624.

It is an arithmetic number, because the mean of its divisors is an integer number (329215080).

Almost surely, 2^1920421265 is an apocalyptic number.

It is an amenable number.

1920421265 is a deficient number, since it is larger than the sum of its proper divisors (713299375).

1920421265 is an equidigital number, since it uses as much as digits as its factorization.

1920421265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54869191.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1920421265 is about 43822.6113439170. The cubic root of 1920421265 is about 1242.9838963107.

The spelling of 1920421265 in words is "one billion, nine hundred twenty million, four hundred twenty-one thousand, two hundred sixty-five".