1109399490 has 144 divisors (see below), whose sum is σ = 3082909752. Its totient is φ = 287214336.

The previous prime is 1109399477. The next prime is 1109399519. The reversal of 1109399490 is 949939011.

It can be written as a sum of positive squares in 4 ways, for example, as 1108290681 + 1108809 = 33291^2 + 1053^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2427342 + ... + 2427798.

Almost surely, 2^1109399490 is an apocalyptic number.

1109399490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1109399490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1541454876).

1109399490 is an abundant number, since it is smaller than the sum of its proper divisors (1973510262).

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

1109399490 is an frugal number, since it uses more digits than its factorization.

1109399490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525 (or 504 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 45.

The square root of 1109399490 is about 33307.6491214856. The cubic root of 1109399490 is about 1035.2120548491.

The spelling of 1109399490 in words is "one billion, one hundred nine million, three hundred ninety-nine thousand, four hundred ninety".