1089388785 has 16 divisors (see below), whose sum is σ = 1753101504. Its totient is φ = 577647552.

The previous prime is 1089388771. The next prime is 1089388793. The reversal of 1089388785 is 5878839801.

It is not a de Polignac number, because 1089388785 - 2¹² = 1089384689 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207307 + ... + 212496.

It is an arithmetic number, because the mean of its divisors is an integer number (109568844).

Almost surely, 2^1089388785 is an apocalyptic number.

1089388785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1089388785 is a deficient number, since it is larger than the sum of its proper divisors (663712719).

1089388785 is a wasteful number, since it uses less digits than its factorization.

1089388785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419984.

The product of its (nonzero) digits is 3870720, while the sum is 57.

The square root of 1089388785 is about 33005.8901561524. The cubic root of 1089388785 is about 1028.9500675120.

The spelling of 1089388785 in words is "one billion, eighty-nine million, three hundred eighty-eight thousand, seven hundred eighty-five".