1089921 has 32 divisors (see below), whose sum is σ = 1824768. Its totient is φ = 564480.

The previous prime is 1089919. The next prime is 1089941. The reversal of 1089921 is 1299801.

It is not a de Polignac number, because 1089921 - 2¹ = 1089919 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 31 ways as a sum of consecutive naturals, for example, 15316 + ... + 15386.

It is an arithmetic number, because the mean of its divisors is an integer number (57024).

2^1089921 is an apocalyptic number.

It is an amenable number.

1089921 is a deficient number, since it is larger than the sum of its proper divisors (734847).

1089921 is a wasteful number, since it uses less digits than its factorization.

1089921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 1089921 is about 1043.9928160672. The cubic root of 1089921 is about 102.9117602896.

The spelling of 1089921 in words is "one million, eighty-nine thousand, nine hundred twenty-one".