100389820 has 12 divisors (see below), whose sum is σ = 210818664. Its totient is φ = 40155920.

The previous prime is 100389797. The next prime is 100389829. The reversal of 100389820 is 28983001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100389829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2509726 + ... + 2509765.

It is an arithmetic number, because the mean of its divisors is an integer number (17568222).

Almost surely, 2^100389820 is an apocalyptic number.

100389820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100389820 is an abundant number, since it is smaller than the sum of its proper divisors (110428844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

100389820 is a wasteful number, since it uses less digits than its factorization.

100389820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5019500 (or 5019498 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 100389820 is about 10019.4720419791. The cubic root of 100389820 is about 464.7612294026.

The spelling of 100389820 in words is "one hundred million, three hundred eighty-nine thousand, eight hundred twenty".