100439215 has 4 divisors (see below), whose sum is σ = 120527064. Its totient is φ = 80351368.

The previous prime is 100439203. The next prime is 100439237. The reversal of 100439215 is 512934001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 512934001 = 8999 ⋅56999.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100439215 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 100439215.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10043917 + ... + 10043926.

It is an arithmetic number, because the mean of its divisors is an integer number (30131766).

Almost surely, 2^100439215 is an apocalyptic number.

100439215 is a deficient number, since it is larger than the sum of its proper divisors (20087849).

100439215 is an equidigital number, since it uses as much as digits as its factorization.

100439215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20087848.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 100439215 is about 10021.9366890836. The cubic root of 100439215 is about 464.8374426972.

The spelling of 100439215 in words is "one hundred million, four hundred thirty-nine thousand, two hundred fifteen".