1089405 has 24 divisors (see below), whose sum is σ = 1935648. Its totient is φ = 566496.

The previous prime is 1089401. The next prime is 1089421. The reversal of 1089405 is 5049801.

It is not a de Polignac number, because 1089405 - 2² = 1089401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1089401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1654 + ... + 2216.

It is an arithmetic number, because the mean of its divisors is an integer number (80652).

2^1089405 is an apocalyptic number.

1089405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1089405 is a deficient number, since it is larger than the sum of its proper divisors (846243).

1089405 is a wasteful number, since it uses less digits than its factorization.

1089405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617 (or 614 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1089405 is about 1043.7456586736. The cubic root of 1089405 is about 102.8955172620.

The spelling of 1089405 in words is "one million, eighty-nine thousand, four hundred five".