931389 has 4 divisors (see below), whose sum is σ = 1241856. Its totient is φ = 620924.

The previous prime is 931387. The next prime is 931417. The reversal of 931389 is 983139.

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 931389 - 2¹ = 931387 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (931387) 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, 155229 + ... + 155234.

It is an arithmetic number, because the mean of its divisors is an integer number (310464).

2⁹³¹³⁸⁹ is an apocalyptic number.

It is an amenable number.

931389 is a deficient number, since it is larger than the sum of its proper divisors (310467).

931389 is a wasteful number, since it uses less digits than its factorization.

931389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310466.

The product of its digits is 5832, while the sum is 33.

The square root of 931389 is about 965.0849703524. The cubic root of 931389 is about 97.6585716803.

The spelling of 931389 in words is "nine hundred thirty-one thousand, three hundred eighty-nine".