918628 has 12 divisors (see below), whose sum is σ = 1617840. Its totient is φ = 456392.

The previous prime is 918613. The next prime is 918641. The reversal of 918628 is 826819.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 918593 and 918602.

It is an unprimeable number.

918628 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, 75 + ... + 1357.

It is an arithmetic number, because the mean of its divisors is an integer number (134820).

2⁹¹⁸⁶²⁸ is an apocalyptic number.

It is an amenable number.

918628 is a deficient number, since it is larger than the sum of its proper divisors (699212).

918628 is a wasteful number, since it uses less digits than its factorization.

918628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1466 (or 1464 counting only the distinct ones).

The product of its digits is 6912, while the sum is 34.

The square root of 918628 is about 958.4508333764. The cubic root of 918628 is about 97.2105110368.

Subtracting from 918628 its reverse (826819), we obtain a square (91809 = 303²).

The spelling of 918628 in words is "nine hundred eighteen thousand, six hundred twenty-eight".