491428838 has 8 divisors (see below), whose sum is σ = 762562080. Its totient is φ = 237241480.

The previous prime is 491428831. The next prime is 491428841. The reversal of 491428838 is 838824194.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 491428792 and 491428801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491428831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4236398 + ... + 4236513.

It is an arithmetic number, because the mean of its divisors is an integer number (95320260).

Almost surely, 2^491428838 is an apocalyptic number.

491428838 is a deficient number, since it is larger than the sum of its proper divisors (271133242).

491428838 is a wasteful number, since it uses less digits than its factorization.

491428838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8472942.

The product of its digits is 442368, while the sum is 47.

The square root of 491428838 is about 22168.1942882139. The cubic root of 491428838 is about 789.1390706595.

The spelling of 491428838 in words is "four hundred ninety-one million, four hundred twenty-eight thousand, eight hundred thirty-eight".