491405 has 8 divisors (see below), whose sum is σ = 610200. Its totient is φ = 379456.

The previous prime is 491377. The next prime is 491417. The reversal of 491405 is 504194.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 175561 + 315844 = 419^2 + 562^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 491405 - 2⁶ = 491341 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1550 + ... + 1839.

It is an arithmetic number, because the mean of its divisors is an integer number (76275).

2⁴⁹¹⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

491405 is a deficient number, since it is larger than the sum of its proper divisors (118795).

491405 is a wasteful number, since it uses less digits than its factorization.

491405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3423.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 491405 is about 701.0028530612. The cubic root of 491405 is about 78.9126310724.

Adding to 491405 its reverse (504194), we get a palindrome (995599).

The spelling of 491405 in words is "four hundred ninety-one thousand, four hundred five".