1921550368 has 24 divisors (see below), whose sum is σ = 3802075200. Its totient is φ = 955944000.

The previous prime is 1921550357. The next prime is 1921550369. The reversal of 1921550368 is 8630551291.

It is a self number, because there is not a number n which added to its sum of digits gives 1921550368.

It is not an unprimeable number, because it can be changed into a prime (1921550369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144508 + ... + 157243.

It is an arithmetic number, because the mean of its divisors is an integer number (158419800).

Almost surely, 2^1921550368 is an apocalyptic number.

It is an amenable number.

1921550368 is a deficient number, since it is larger than the sum of its proper divisors (1880524832).

1921550368 is a wasteful number, since it uses less digits than its factorization.

1921550368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301960 (or 301952 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 1921550368 is about 43835.4921040018. The cubic root of 1921550368 is about 1243.2274508387.

It can be divided in two parts, 192155036 and 8, that added together give a square (192155044 = 13862²).

The spelling of 1921550368 in words is "one billion, nine hundred twenty-one million, five hundred fifty thousand, three hundred sixty-eight".