491490 has 48 divisors (see below), whose sum is σ = 1317888. Its totient is φ = 127008.

The previous prime is 491489. The next prime is 491497. The reversal of 491490 is 94194.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (491497) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3807 + ... + 3933.

It is an arithmetic number, because the mean of its divisors is an integer number (27456).

2⁴⁹¹⁴⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (658944).

491490 is an abundant number, since it is smaller than the sum of its proper divisors (826398).

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

491490 is a wasteful number, since it uses less digits than its factorization.

491490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 491490 is about 701.0634778677. The cubic root of 491490 is about 78.9171807391.

The spelling of 491490 in words is "four hundred ninety-one thousand, four hundred ninety".