1099276920 has 320 divisors, whose sum is σ = 4446604800. Its totient is φ = 237945600.

The previous prime is 1099276907. The next prime is 1099276921. The reversal of 1099276920 is 296729901.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1099276921) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 429645 + ... + 432195.

It is an arithmetic number, because the mean of its divisors is an integer number (13895640).

Almost surely, 2^1099276920 is an apocalyptic number.

1099276920 is a gapful number since it is divisible by the number (10) 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 1099276920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2223302400).

1099276920 is an abundant number, since it is smaller than the sum of its proper divisors (3347327880).

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

1099276920 is a wasteful number, since it uses less digits than its factorization.

1099276920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2600 (or 2587 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 1099276920 is about 33155.3452704085. The cubic root of 1099276920 is about 1032.0538776631.

The spelling of 1099276920 in words is "one billion, ninety-nine million, two hundred seventy-six thousand, nine hundred twenty".