1099721448 has 320 divisors, whose sum is σ = 3746856960. Its totient is φ = 294585984.

The previous prime is 1099721443. The next prime is 1099721453. The reversal of 1099721448 is 8441279901.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1099721443) and next prime (1099721453).

It is not an unprimeable number, because it can be changed into a prime (1099721443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 8659161 + ... + 8659287.

It is an arithmetic number, because the mean of its divisors is an integer number (11708928).

Almost surely, 2^1099721448 is an apocalyptic number.

1099721448 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 1099721448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1873428480).

1099721448 is an abundant number, since it is smaller than the sum of its proper divisors (2647135512).

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

1099721448 is a wasteful number, since it uses less digits than its factorization.

1099721448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258 (or 245 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 1099721448 is about 33162.0483082695. The cubic root of 1099721448 is about 1032.1929736486.

The spelling of 1099721448 in words is "one billion, ninety-nine million, seven hundred twenty-one thousand, four hundred forty-eight".