491670 has 40 divisors (see below), whose sum is σ = 1324224. Its totient is φ = 130896.

The previous prime is 491669. The next prime is 491677. The reversal of 491670 is 76194.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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 19 ways as a sum of consecutive naturals, for example, 507 + ... + 1113.

2⁴⁹¹⁶⁷⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (662112).

491670 is an abundant number, since it is smaller than the sum of its proper divisors (832554).

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

491670 is a wasteful number, since it uses less digits than its factorization.

491670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626 (or 617 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 491670 is about 701.1918425082. The cubic root of 491670 is about 78.9268135962.

The spelling of 491670 in words is "four hundred ninety-one thousand, six hundred seventy".