491667 has 16 divisors (see below), whose sum is σ = 732672. Its totient is φ = 290720.

The previous prime is 491653. The next prime is 491669. The reversal of 491667 is 766194.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 491667 - 2⁴ = 491651 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

Its product of digits (9072) is a multiple of the sum of its prime divisors (378).

491667 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (491669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1393 + ... + 1709.

It is an arithmetic number, because the mean of its divisors is an integer number (45792).

2⁴⁹¹⁶⁶⁷ is an apocalyptic number.

491667 is a gapful number since it is divisible by the number (47) formed by its first and last digit.

491667 is a deficient number, since it is larger than the sum of its proper divisors (241005).

491667 is a wasteful number, since it uses less digits than its factorization.

491667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378.

The product of its digits is 9072, while the sum is 33.

The square root of 491667 is about 701.1897032901. The cubic root of 491667 is about 78.9266530678.

The spelling of 491667 in words is "four hundred ninety-one thousand, six hundred sixty-seven".