491387 has 4 divisors (see below), whose sum is σ = 529200. Its totient is φ = 453576.

The previous prime is 491377. The next prime is 491417. The reversal of 491387 is 783194.

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

It is a cyclic number.

It is not a de Polignac number, because 491387 - 2⁴ = 491371 is a prime.

It is a super-2 number, since 2×491387² = 482922367538, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 491387.

It is not an unprimeable number, because it can be changed into a prime (491327) 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, 18887 + ... + 18912.

It is an arithmetic number, because the mean of its divisors is an integer number (132300).

2⁴⁹¹³⁸⁷ is an apocalyptic number.

491387 is a deficient number, since it is larger than the sum of its proper divisors (37813).

491387 is a wasteful number, since it uses less digits than its factorization.

491387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37812.

The product of its digits is 6048, while the sum is 32.

The square root of 491387 is about 700.9900141942. The cubic root of 491387 is about 78.9116675462.

It can be divided in two parts, 491 and 387, that added together give a palindrome (878).

The spelling of 491387 in words is "four hundred ninety-one thousand, three hundred eighty-seven".