1921867632 has 120 divisors (see below), whose sum is σ = 5707253760. Its totient is φ = 602017920.

The previous prime is 1921867621. The next prime is 1921867639. The reversal of 1921867632 is 2367681291.

1921867632 is a `hidden beast` number, since 1 + 9 + 2 + 1 + 8 + 6 + 7 + 632 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921867639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 344707 + ... + 350237.

It is an arithmetic number, because the mean of its divisors is an integer number (47560448).

Almost surely, 2^1921867632 is an apocalyptic number.

1921867632 is a gapful number since it is divisible by the number (12) 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 1921867632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2853626880).

1921867632 is an abundant number, since it is smaller than the sum of its proper divisors (3785386128).

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

1921867632 is a wasteful number, since it uses less digits than its factorization.

1921867632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5691 (or 5682 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 1921867632 is about 43839.1107574047. The cubic root of 1921867632 is about 1243.2958694820.

The spelling of 1921867632 in words is "one billion, nine hundred twenty-one million, eight hundred sixty-seven thousand, six hundred thirty-two".