1103891728 has 20 divisors (see below), whose sum is σ = 2212542540. Its totient is φ = 532913024.

The previous prime is 1103891717. The next prime is 1103891729. The reversal of 1103891728 is 8271983011.

It can be written as a sum of positive squares in 2 ways, for example, as 863889664 + 240002064 = 29392^2 + 15492^2 .

It is not an unprimeable number, because it can be changed into a prime (1103891729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1189075 + ... + 1190002.

It is an arithmetic number, because the mean of its divisors is an integer number (110627127).

Almost surely, 2^1103891728 is an apocalyptic number.

It is an amenable number.

1103891728 is an abundant number, since it is smaller than the sum of its proper divisors (1108650812).

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

1103891728 is a wasteful number, since it uses less digits than its factorization.

1103891728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2379114 (or 2379108 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 1103891728 is about 33224.8661095873. The cubic root of 1103891728 is about 1033.4960624285.

The spelling of 1103891728 in words is "one billion, one hundred three million, eight hundred ninety-one thousand, seven hundred twenty-eight".