1089621 has 24 divisors (see below), whose sum is σ = 1732640. Its totient is φ = 655776.

The previous prime is 1089611. The next prime is 1089629. The reversal of 1089621 is 1269801.

It is not a de Polignac number, because 1089621 - 2¹³ = 1081429 is a prime.

It is a plaindrome in base 12.

It is a zygodrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1089629) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 7770 + ... + 7908.

2^1089621 is an apocalyptic number.

1089621 is the 603-rd octagonal number.

It is an amenable number.

1089621 is a deficient number, since it is larger than the sum of its proper divisors (643019).

1089621 is a wasteful number, since it uses less digits than its factorization.

1089621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 1089621 is about 1043.8491270294. The cubic root of 1089621 is about 102.9023172929.

The spelling of 1089621 in words is "one million, eighty-nine thousand, six hundred twenty-one".