1921220288 has 56 divisors (see below), whose sum is σ = 4238183040. Its totient is φ = 858101760.

The previous prime is 1921220281. The next prime is 1921220293. The reversal of 1921220288 is 8820221291.

It is not an unprimeable number, because it can be changed into a prime (1921220281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11453 + ... + 63036.

It is an arithmetic number, because the mean of its divisors is an integer number (75681840).

Almost surely, 2^1921220288 is an apocalyptic number.

It is an amenable number.

1921220288 is an abundant number, since it is smaller than the sum of its proper divisors (2316962752).

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

1921220288 is a wasteful number, since it uses less digits than its factorization.

1921220288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74545 (or 74535 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 1921220288 is about 43831.7269566236. The cubic root of 1921220288 is about 1243.1562604043.

The spelling of 1921220288 in words is "one billion, nine hundred twenty-one million, two hundred twenty thousand, two hundred eighty-eight".