1109391738 has 64 divisors (see below), whose sum is σ = 2755130112. Its totient is φ = 289981440.

The previous prime is 1109391733. The next prime is 1109391739. The reversal of 1109391738 is 8371939011.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 1109391738.

It is not an unprimeable number, because it can be changed into a prime (1109391733) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52708 + ... + 70688.

It is an arithmetic number, because the mean of its divisors is an integer number (43048908).

Almost surely, 2^1109391738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1109391738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1377565056).

1109391738 is an abundant number, since it is smaller than the sum of its proper divisors (1645738374).

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

1109391738 is a wasteful number, since it uses less digits than its factorization.

1109391738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18119.

The product of its (nonzero) digits is 40824, while the sum is 42.

The square root of 1109391738 is about 33307.5327516164. The cubic root of 1109391738 is about 1035.2096436400.

It can be divided in two parts, 11093 and 91738, that added together give a triangular number (102831 = T₄₅₃).

The spelling of 1109391738 in words is "one billion, one hundred nine million, three hundred ninety-one thousand, seven hundred thirty-eight".