1917227844 has 72 divisors (see below), whose sum is σ = 5543848128. Its totient is φ = 547266240.

The previous prime is 1917227843. The next prime is 1917227867. The reversal of 1917227844 is 4487227191.

It is a self number, because there is not a number n which added to its sum of digits gives 1917227844.

It is not an unprimeable number, because it can be changed into a prime (1917227843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 326454 + ... + 332274.

Almost surely, 2^1917227844 is an apocalyptic number.

1917227844 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1917227844 is an abundant number, since it is smaller than the sum of its proper divisors (3626620284).

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

1917227844 is a wasteful number, since it uses less digits than its factorization.

1917227844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7145 (or 7140 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 1917227844 is about 43786.1604162777. The cubic root of 1917227844 is about 1242.2945383430.

The spelling of 1917227844 in words is "one billion, nine hundred seventeen million, two hundred twenty-seven thousand, eight hundred forty-four".