1939221648 has 540 divisors, whose sum is σ = 7303399740. Its totient is φ = 493807104.

The previous prime is 1939221631. The next prime is 1939221653. The reversal of 1939221648 is 8461229391.

1939221648 is a `hidden beast` number, since 1 + 9 + 392 + 216 + 48 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 622402704 + 1316818944 = 24948^2 + 36288^2 .

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

Its product of digits (186624) is a multiple of the sum of its prime divisors (54).

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 66869698 + ... + 66869726.

Almost surely, 2^1939221648 is an apocalyptic number.

1939221648 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 1939221648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3651699870).

1939221648 is an abundant number, since it is smaller than the sum of its proper divisors (5364178092).

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

1939221648 is an equidigital number, since it uses as much as digits as its factorization.

1939221648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88 (or 54 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 1939221648 is about 44036.5944187332. The cubic root of 1939221648 is about 1247.0268856527.

The spelling of 1939221648 in words is "one billion, nine hundred thirty-nine million, two hundred twenty-one thousand, six hundred forty-eight".