491673 has 16 divisors (see below), whose sum is σ = 807296. Its totient is φ = 259200.

The previous prime is 491669. The next prime is 491677. The reversal of 491673 is 376194.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (491669) and next prime (491677).

It is not a de Polignac number, because 491673 - 2² = 491669 is a prime.

It is an Ulam number.

It is a Curzon number.

491673 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 491673.

It is not an unprimeable number, because it can be changed into a prime (491677) 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, 628 + ... + 1173.

It is an arithmetic number, because the mean of its divisors is an integer number (50456).

2⁴⁹¹⁶⁷³ is an apocalyptic number.

It is an amenable number.

491673 is a deficient number, since it is larger than the sum of its proper divisors (315623).

491673 is a wasteful number, since it uses less digits than its factorization.

491673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1824.

The product of its digits is 4536, while the sum is 30.

The square root of 491673 is about 701.1939817198. The cubic root of 491673 is about 78.9269741239.

The spelling of 491673 in words is "four hundred ninety-one thousand, six hundred seventy-three".