491868408 has 32 divisors (see below), whose sum is σ = 1252875600. Its totient is φ = 160862208.

The previous prime is 491868401. The next prime is 491868439. The reversal of 491868408 is 804868194.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491868401) 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, 192073 + ... + 194616.

Almost surely, 2^491868408 is an apocalyptic number.

It is an amenable number.

491868408 is an abundant number, since it is smaller than the sum of its proper divisors (761007192).

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

491868408 is a wasteful number, since it uses less digits than its factorization.

491868408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386751 (or 386747 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 48.

The square root of 491868408 is about 22178.1065016831. The cubic root of 491868408 is about 789.3742884979.

The spelling of 491868408 in words is "four hundred ninety-one million, eight hundred sixty-eight thousand, four hundred eight".