133188387 has 16 divisors (see below), whose sum is σ = 194516640. Its totient is φ = 80686592.

The previous prime is 133188379. The next prime is 133188389. The reversal of 133188387 is 783881331.

It is a cyclic number.

It is not a de Polignac number, because 133188387 - 2³ = 133188379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133188389) 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, 43548 + ... + 46505.

It is an arithmetic number, because the mean of its divisors is an integer number (12157290).

Almost surely, 2^133188387 is an apocalyptic number.

133188387 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

133188387 is a deficient number, since it is larger than the sum of its proper divisors (61328253).

133188387 is a wasteful number, since it uses less digits than its factorization.

133188387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90102.

The product of its digits is 96768, while the sum is 42.

The square root of 133188387 is about 11540.7273167682. The cubic root of 133188387 is about 510.6877649022.

The spelling of 133188387 in words is "one hundred thirty-three million, one hundred eighty-eight thousand, three hundred eighty-seven".