491857692 has 12 divisors (see below), whose sum is σ = 1147667976. Its totient is φ = 163952560.

The previous prime is 491857673. The next prime is 491857697. The reversal of 491857692 is 296758194.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491857697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20494059 + ... + 20494082.

It is an arithmetic number, because the mean of its divisors is an integer number (95638998).

Almost surely, 2^491857692 is an apocalyptic number.

It is an amenable number.

491857692 is an abundant number, since it is smaller than the sum of its proper divisors (655810284).

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

491857692 is a wasteful number, since it uses less digits than its factorization.

491857692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40988148 (or 40988146 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 51.

The square root of 491857692 is about 22177.8649107618. The cubic root of 491857692 is about 789.3685559374.

The spelling of 491857692 in words is "four hundred ninety-one million, eight hundred fifty-seven thousand, six hundred ninety-two".