1099538220 has 48 divisors (see below), whose sum is σ = 3358591488. Its totient is φ = 266554560.

The previous prime is 1099538201. The next prime is 1099538221. The reversal of 1099538220 is 228359901.

It is not an unprimeable number, because it can be changed into a prime (1099538221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 832324 + ... + 833643.

It is an arithmetic number, because the mean of its divisors is an integer number (69970656).

Almost surely, 2^1099538220 is an apocalyptic number.

1099538220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1099538220 is an abundant number, since it is smaller than the sum of its proper divisors (2259053268).

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

1099538220 is a wasteful number, since it uses less digits than its factorization.

1099538220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665990 (or 1665988 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 1099538220 is about 33159.2855773462. The cubic root of 1099538220 is about 1032.1356448407.

The spelling of 1099538220 in words is "one billion, ninety-nine million, five hundred thirty-eight thousand, two hundred twenty".