490840891 has 8 divisors (see below), whose sum is σ = 493433024. Its totient is φ = 488255040.

The previous prime is 490840879. The next prime is 490840913. The reversal of 490840891 is 198048094.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-490840891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (490840811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252961 + ... + 254893.

It is an arithmetic number, because the mean of its divisors is an integer number (61679128).

Almost surely, 2^490840891 is an apocalyptic number.

490840891 is a deficient number, since it is larger than the sum of its proper divisors (2592133).

490840891 is a wasteful number, since it uses less digits than its factorization.

490840891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3141.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 490840891 is about 22154.9292709320. The cubic root of 490840891 is about 788.8242355848.

The spelling of 490840891 in words is "four hundred ninety million, eight hundred forty thousand, eight hundred ninety-one".