491512420 has 24 divisors (see below), whose sum is σ = 1179630144. Its totient is φ = 168518496.

The previous prime is 491512391. The next prime is 491512451. The reversal of 491512420 is 24215194.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1755262 + ... + 1755541.

It is an arithmetic number, because the mean of its divisors is an integer number (49151256).

Almost surely, 2^491512420 is an apocalyptic number.

It is an amenable number.

491512420 is an abundant number, since it is smaller than the sum of its proper divisors (688117724).

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

491512420 is a wasteful number, since it uses less digits than its factorization.

491512420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3510819 (or 3510817 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 491512420 is about 22170.0793864163. The cubic root of 491512420 is about 789.1838069317.

The spelling of 491512420 in words is "four hundred ninety-one million, five hundred twelve thousand, four hundred twenty".