1921899248 has 40 divisors (see below), whose sum is σ = 3957782400. Its totient is φ = 901520064.

The previous prime is 1921899247. The next prime is 1921899257. The reversal of 1921899248 is 8429981291.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1921899248.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921899247) 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 7 ways as a sum of consecutive naturals, for example, 623 + ... + 62001.

It is an arithmetic number, because the mean of its divisors is an integer number (98944560).

Almost surely, 2^1921899248 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 1921899248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1978891200).

1921899248 is an abundant number, since it is smaller than the sum of its proper divisors (2035883152).

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

1921899248 is a wasteful number, since it uses less digits than its factorization.

1921899248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61509 (or 61503 counting only the distinct ones).

The product of its digits is 746496, while the sum is 53.

The square root of 1921899248 is about 43839.4713471775. The cubic root of 1921899248 is about 1243.3026871258.

The spelling of 1921899248 in words is "one billion, nine hundred twenty-one million, eight hundred ninety-nine thousand, two hundred forty-eight".