491958 has 24 divisors (see below), whose sum is σ = 1078896. Its totient is φ = 162000.

The previous prime is 491951. The next prime is 491969. The reversal of 491958 is 859194.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491951) by changing a digit.

491958 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2628 + ... + 2808.

It is an arithmetic number, because the mean of its divisors is an integer number (44954).

2⁴⁹¹⁹⁵⁸ is an apocalyptic number.

491958 is an abundant number, since it is smaller than the sum of its proper divisors (586938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491958 is a wasteful number, since it uses less digits than its factorization.

491958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340 (or 337 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 491958 is about 701.3971770687. The cubic root of 491958 is about 78.9422212785.

Subtracting 491958 from its reverse (859194), we obtain a square (367236 = 606²).

The spelling of 491958 in words is "four hundred ninety-one thousand, nine hundred fifty-eight".