100388889 has 24 divisors (see below), whose sum is σ = 151962720. Its totient is φ = 66220416.

The previous prime is 100388887. The next prime is 100388903. The reversal of 100388889 is 988883001.

It is not a de Polignac number, because 100388889 - 2¹ = 100388887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100388887) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21442 + ... + 25700.

It is an arithmetic number, because the mean of its divisors is an integer number (6331780).

Almost surely, 2^100388889 is an apocalyptic number.

It is an amenable number.

100388889 is a deficient number, since it is larger than the sum of its proper divisors (51573831).

100388889 is an frugal number, since it uses more digits than its factorization.

100388889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4371 (or 4359 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The square root of 100388889 is about 10019.4255823375. The cubic root of 100388889 is about 464.7597926897.

The spelling of 100388889 in words is "one hundred million, three hundred eighty-eight thousand, eight hundred eighty-nine".