1921260320 has 48 divisors (see below), whose sum is σ = 5187405888. Its totient is φ = 658717440.

The previous prime is 1921260317. The next prime is 1921260343. The reversal of 1921260320 is 230621291.

It is a self number, because there is not a number n which added to its sum of digits gives 1921260320.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 856586 + ... + 858825.

It is an arithmetic number, because the mean of its divisors is an integer number (108070956).

Almost surely, 2^1921260320 is an apocalyptic number.

1921260320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1921260320 is an abundant number, since it is smaller than the sum of its proper divisors (3266145568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1921260320 is a wasteful number, since it uses less digits than its factorization.

1921260320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1715433 (or 1715425 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 1921260320 is about 43832.1836097633. The cubic root of 1921260320 is about 1243.1648947925.

The spelling of 1921260320 in words is "one billion, nine hundred twenty-one million, two hundred sixty thousand, three hundred twenty".