911389 has 4 divisors (see below), whose sum is σ = 933660. Its totient is φ = 889120.

The previous prime is 911371. The next prime is 911413. The reversal of 911389 is 983119.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 128164 + 783225 = 358^2 + 885^2 .

It is a cyclic number.

It is not a de Polignac number, because 911389 - 2⁵ = 911357 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 911389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (911359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11074 + ... + 11155.

It is an arithmetic number, because the mean of its divisors is an integer number (233415).

2⁹¹¹³⁸⁹ is an apocalyptic number.

It is an amenable number.

911389 is a deficient number, since it is larger than the sum of its proper divisors (22271).

911389 is a wasteful number, since it uses less digits than its factorization.

911389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22270.

The product of its digits is 1944, while the sum is 31.

The square root of 911389 is about 954.6669576350. Note that the first 3 decimals coincide. The cubic root of 911389 is about 96.9544902892.

The spelling of 911389 in words is "nine hundred eleven thousand, three hundred eighty-nine".