1099721952 has 72 divisors (see below), whose sum is σ = 3574102896. Its totient is φ = 314205696.

The previous prime is 1099721927. The next prime is 1099721971. The reversal of 1099721952 is 2591279901.

It is a tau number, because it is divible by the number of its divisors (72).

It is a junction number, because it is equal to n+sod(n) for n = 1099721898 and 1099721907.

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, 270733 + ... + 274764.

It is an arithmetic number, because the mean of its divisors is an integer number (49640318).

Almost surely, 2^1099721952 is an apocalyptic number.

1099721952 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1099721952 is an abundant number, since it is smaller than the sum of its proper divisors (2474380944).

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

1099721952 is a wasteful number, since it uses less digits than its factorization.

1099721952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545520 (or 545509 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 45.

The square root of 1099721952 is about 33162.0559073167. The cubic root of 1099721952 is about 1032.1931313325.

The spelling of 1099721952 in words is "one billion, ninety-nine million, seven hundred twenty-one thousand, nine hundred fifty-two".