1089428 has 24 divisors (see below), whose sum is σ = 2077992. Its totient is φ = 497664.

The previous prime is 1089427. The next prime is 1089457. The reversal of 1089428 is 8249801.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 293764 + 795664 = 542^2 + 892^2 .

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1089394 and 1089403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1089421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2300 + ... + 2732.

It is an arithmetic number, because the mean of its divisors is an integer number (86583).

2^1089428 is an apocalyptic number.

It is an amenable number.

1089428 is a deficient number, since it is larger than the sum of its proper divisors (988564).

1089428 is a wasteful number, since it uses less digits than its factorization.

1089428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 1089428 is about 1043.7566766254. The cubic root of 1089428 is about 102.8962413821.

The spelling of 1089428 in words is "one million, eighty-nine thousand, four hundred twenty-eight".