100389213 has 20 divisors (see below), whose sum is σ = 155138940. Its totient is φ = 64616832.

The previous prime is 100389209. The next prime is 100389221. The reversal of 100389213 is 312983001.

It can be written as a sum of positive squares in 2 ways, for example, as 63154809 + 37234404 = 7947^2 + 6102^2 .

It is not a de Polignac number, because 100389213 - 2² = 100389209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100389283) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 19020 + ... + 23717.

It is an arithmetic number, because the mean of its divisors is an integer number (7756947).

Almost surely, 2^100389213 is an apocalyptic number.

It is an amenable number.

100389213 is a deficient number, since it is larger than the sum of its proper divisors (54749727).

100389213 is an equidigital number, since it uses as much as digits as its factorization.

100389213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42778 (or 42769 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 100389213 is about 10019.4417509161. The cubic root of 100389213 is about 464.7602926853.

The spelling of 100389213 in words is "one hundred million, three hundred eighty-nine thousand, two hundred thirteen".