491400000 has 672 divisors, whose sum is σ = 2222357760. Its totient is φ = 103680000.

The previous prime is 491399999. The next prime is 491400031. The reversal of 491400000 is 4194.

It is a tau number, because it is divible by the number of its divisors (672).

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.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 37799994 + ... + 37800006.

It is an arithmetic number, because the mean of its divisors is an integer number (3307080).

Almost surely, 2^491400000 is an apocalyptic number.

491400000 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 491400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1111178880).

491400000 is an abundant number, since it is smaller than the sum of its proper divisors (1730957760).

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

491400000 is an equidigital number, since it uses as much as digits as its factorization.

491400000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66 (or 30 counting only the distinct ones).

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

The square root of 491400000 is about 22167.5438422934. The cubic root of 491400000 is about 789.1236342857.

Adding to 491400000 its reverse (4194), we get a palindrome (491404194).

The spelling of 491400000 in words is "four hundred ninety-one million, four hundred thousand".