918728 has 16 divisors (see below), whose sum is σ = 1765260. Its totient is φ = 448000.

The previous prime is 918683. The next prime is 918733. The reversal of 918728 is 827819.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 850084 + 68644 = 922^2 + 262^2 .

It is a super-2 number, since 2×918728² = 1688122275968, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 918728.

It is an unprimeable number.

918728 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 (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1073 + ... + 1728.

2⁹¹⁸⁷²⁸ is an apocalyptic number.

It is an amenable number.

918728 is a deficient number, since it is larger than the sum of its proper divisors (846532).

918728 is a wasteful number, since it uses less digits than its factorization.

918728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2848 (or 2844 counting only the distinct ones).

The product of its digits is 8064, while the sum is 35.

The square root of 918728 is about 958.5029994737. The cubic root of 918728 is about 97.2140382892.

Subtracting from 918728 its reverse (827819), we obtain a palindrome (90909).

The spelling of 918728 in words is "nine hundred eighteen thousand, seven hundred twenty-eight".