1089945 has 24 divisors (see below), whose sum is σ = 1929096. Its totient is φ = 569088.

The previous prime is 1089943. The next prime is 1089961. The reversal of 1089945 is 5499801.

It can be written as a sum of positive squares in 4 ways, for example, as 389376 + 700569 = 624^2 + 837^2 .

It is not a de Polignac number, because 1089945 - 2¹ = 1089943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1089941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2157 + ... + 2613.

It is an arithmetic number, because the mean of its divisors is an integer number (80379).

2^1089945 is an apocalyptic number.

1089945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1089945 is a deficient number, since it is larger than the sum of its proper divisors (839151).

1089945 is a wasteful number, since it uses less digits than its factorization.

1089945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521 (or 518 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1089945 is about 1044.0043103359. The cubic root of 1089945 is about 102.9125156545.

The spelling of 1089945 in words is "one million, eighty-nine thousand, nine hundred forty-five".