133788889 has 16 divisors (see below), whose sum is σ = 146361600. Its totient is φ = 121559616.

The previous prime is 133788887. The next prime is 133788947. The reversal of 133788889 is 988887331.

It is a cyclic number.

It is not a de Polignac number, because 133788889 - 2¹ = 133788887 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (133788881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 372492 + ... + 372850.

It is an arithmetic number, because the mean of its divisors is an integer number (9147600).

Almost surely, 2^133788889 is an apocalyptic number.

It is an amenable number.

133788889 is a deficient number, since it is larger than the sum of its proper divisors (12572711).

133788889 is a wasteful number, since it uses less digits than its factorization.

133788889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744.

The product of its digits is 2322432, while the sum is 55.

The square root of 133788889 is about 11566.7147021097. The cubic root of 133788889 is about 511.4541212206.

The spelling of 133788889 in words is "one hundred thirty-three million, seven hundred eighty-eight thousand, eight hundred eighty-nine".