1921849072 has 60 divisors (see below), whose sum is σ = 4398662664. Its totient is φ = 806357760.

The previous prime is 1921849049. The next prime is 1921849081. The reversal of 1921849072 is 2709481291.

It is a happy number.

It is a super-2 number, since 2×1921849072² = 7387007711094522368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2563 + ... + 62050.

Almost surely, 2^1921849072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1921849072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2199331332).

1921849072 is an abundant number, since it is smaller than the sum of its proper divisors (2476813592).

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

1921849072 is a wasteful number, since it uses less digits than its factorization.

1921849072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64658 (or 64639 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 1921849072 is about 43838.8990737678. The cubic root of 1921849072 is about 1243.2918671867.

The spelling of 1921849072 in words is "one billion, nine hundred twenty-one million, eight hundred forty-nine thousand, seventy-two".