491389 has 4 divisors (see below), whose sum is σ = 493056. Its totient is φ = 489724.

The previous prime is 491377. The next prime is 491417. The reversal of 491389 is 983194.

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 491389 - 2⁵ = 491357 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 (491329) 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, 259 + ... + 1024.

It is an arithmetic number, because the mean of its divisors is an integer number (123264).

2⁴⁹¹³⁸⁹ is an apocalyptic number.

It is an amenable number.

491389 is a deficient number, since it is larger than the sum of its proper divisors (1667).

491389 is a wasteful number, since it uses less digits than its factorization.

491389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1666.

The product of its digits is 7776, while the sum is 34.

The square root of 491389 is about 700.9914407466. The cubic root of 491389 is about 78.9117746058.

The spelling of 491389 in words is "four hundred ninety-one thousand, three hundred eighty-nine".