1944921888 has 384 divisors, whose sum is σ = 7230988800. Its totient is φ = 494678016.

The previous prime is 1944921841. The next prime is 1944921889. The reversal of 1944921888 is 8881294491.

It is a happy number.

1944921888 is a `hidden beast` number, since 19 + 449 + 2 + 188 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1944921889) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2279670 + ... + 2280522.

It is an arithmetic number, because the mean of its divisors is an integer number (18830700).

Almost surely, 2^1944921888 is an apocalyptic number.

1944921888 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1944921888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3615494400).

1944921888 is an abundant number, since it is smaller than the sum of its proper divisors (5286066912).

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

1944921888 is a wasteful number, since it uses less digits than its factorization.

1944921888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921 (or 907 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 54.

The square root of 1944921888 is about 44101.2685531834. The cubic root of 1944921888 is about 1248.2475470484.

The spelling of 1944921888 in words is "one billion, nine hundred forty-four million, nine hundred twenty-one thousand, eight hundred eighty-eight".