1111728389 has 4 divisors (see below), whose sum is σ = 1112044320. Its totient is φ = 1111412460.

The previous prime is 1111728377. The next prime is 1111728503. The reversal of 1111728389 is 9838271111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1111728389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111721389) 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, 152627 + ... + 159744.

It is an arithmetic number, because the mean of its divisors is an integer number (278011080).

Almost surely, 2^1111728389 is an apocalyptic number.

It is an amenable number.

1111728389 is a deficient number, since it is larger than the sum of its proper divisors (315931).

1111728389 is an equidigital number, since it uses as much as digits as its factorization.

1111728389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315930.

The product of its digits is 24192, while the sum is 41.

The square root of 1111728389 is about 33342.5912160408. The cubic root of 1111728389 is about 1035.9359357358.

The spelling of 1111728389 in words is "one billion, one hundred eleven million, seven hundred twenty-eight thousand, three hundred eighty-nine".