1100389 has 4 divisors (see below), whose sum is σ = 1148256. Its totient is φ = 1052524.

The previous prime is 1100387. The next prime is 1100419. The reversal of 1100389 is 9830011.

1100389 = T₈₅₅ + T₈₅₆ + T₈₅₇.

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 not a de Polignac number, because 1100389 - 2¹ = 1100387 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100381) 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, 23899 + ... + 23944.

It is an arithmetic number, because the mean of its divisors is an integer number (287064).

2^1100389 is an apocalyptic number.

1100389 is the 857-th centered triangular number.

It is an amenable number.

1100389 is a deficient number, since it is larger than the sum of its proper divisors (47867).

1100389 is an equidigital number, since it uses as much as digits as its factorization.

1100389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47866.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1100389 is about 1048.9942802513. The cubic root of 1100389 is about 103.2401785044.

The spelling of 1100389 in words is "one million, one hundred thousand, three hundred eighty-nine".