491130390 has 64 divisors (see below), whose sum is σ = 1213470720. Its totient is φ = 127138560.

The previous prime is 491130389. The next prime is 491130407. The reversal of 491130390 is 93031194.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 278331 + ... + 280089.

It is an arithmetic number, because the mean of its divisors is an integer number (18960480).

Almost surely, 2^491130390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491130390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (606735360).

491130390 is an abundant number, since it is smaller than the sum of its proper divisors (722340330).

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

491130390 is a wasteful number, since it uses less digits than its factorization.

491130390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2037.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 491130390 is about 22161.4618200154. The cubic root of 491130390 is about 788.9792885084.

The spelling of 491130390 in words is "four hundred ninety-one million, one hundred thirty thousand, three hundred ninety".