1921885446 has 64 divisors (see below), whose sum is σ = 4212149760. Its totient is φ = 581057280.

The previous prime is 1921885429. The next prime is 1921885453. The reversal of 1921885446 is 6445881291.

It is a junction number, because it is equal to n+sod(n) for n = 1921885395 and 1921885404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1115866 + ... + 1117586.

It is an arithmetic number, because the mean of its divisors is an integer number (65814840).

Almost surely, 2^1921885446 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1921885446, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2106074880).

1921885446 is an abundant number, since it is smaller than the sum of its proper divisors (2290264314).

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

1921885446 is a wasteful number, since it uses less digits than its factorization.

1921885446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1981.

The product of its digits is 552960, while the sum is 48.

The square root of 1921885446 is about 43839.3139316755. The cubic root of 1921885446 is about 1243.2997108850.

The spelling of 1921885446 in words is "one billion, nine hundred twenty-one million, eight hundred eighty-five thousand, four hundred forty-six".