491400 has 192 divisors, whose sum is σ = 2083200. Its totient is φ = 103680.

The previous prime is 491377. The next prime is 491417. The reversal of 491400 is 4194.

It is a Cunningham number, because it is equal to 701²-1.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

491400 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 47 ways as a sum of consecutive naturals, for example, 37794 + ... + 37806.

It is an arithmetic number, because the mean of its divisors is an integer number (10850).

2⁴⁹¹⁴⁰⁰ is an apocalyptic number.

491400 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1041600).

491400 is an abundant number, since it is smaller than the sum of its proper divisors (1591800).

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

491400 is a wasteful number, since it uses less digits than its factorization.

491400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45 (or 30 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 491400 is about 700.9992867329. Note that the first 3 decimals coincide. The cubic root of 491400 is about 78.9123634286.

Adding to 491400 its reverse (4194), we get a palindrome (495594).

The spelling of 491400 in words is "four hundred ninety-one thousand, four hundred".