491428 has 12 divisors (see below), whose sum is σ = 982912. Its totient is φ = 210600.

The previous prime is 491423. The next prime is 491429. The reversal of 491428 is 824194.

491428 is an admirable number.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 17551 = 491428 / (4 + 9 + 1 + 4 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 491396 and 491405.

It is not an unprimeable number, because it can be changed into a prime (491423) by changing a digit.

491428 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8748 + ... + 8803.

2⁴⁹¹⁴²⁸ is an apocalyptic number.

It is an amenable number.

491428 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

491428 is a wasteful number, since it uses less digits than its factorization.

491428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17562 (or 17560 counting only the distinct ones).

The product of its digits is 2304, while the sum is 28.

The square root of 491428 is about 701.0192579380. The cubic root of 491428 is about 78.9138622104.

It can be divided in two parts, 491 and 428, that added together give a palindrome (919).

The spelling of 491428 in words is "four hundred ninety-one thousand, four hundred twenty-eight".