491223408 has 40 divisors (see below), whose sum is σ = 1366610448. Its totient is φ = 151145472.

The previous prime is 491223391. The next prime is 491223409. The reversal of 491223408 is 804322194.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491223409) 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, 392985 + ... + 394232.

Almost surely, 2^491223408 is an apocalyptic number.

491223408 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

491223408 is an abundant number, since it is smaller than the sum of its proper divisors (875387040).

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

491223408 is a wasteful number, since it uses less digits than its factorization.

491223408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787241 (or 787235 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 491223408 is about 22163.5603638044. The cubic root of 491223408 is about 789.0290951343.

The spelling of 491223408 in words is "four hundred ninety-one million, two hundred twenty-three thousand, four hundred eight".