100438123 has 4 divisors (see below), whose sum is σ = 105724360. Its totient is φ = 95151888.

The previous prime is 100438099. The next prime is 100438133. The reversal of 100438123 is 321834001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 100438123 - 2⁹ = 100437611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100438094 and 100438103.

It is not an unprimeable number, because it can be changed into a prime (100438133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2643090 + ... + 2643127.

It is an arithmetic number, because the mean of its divisors is an integer number (26431090).

Almost surely, 2^100438123 is an apocalyptic number.

100438123 is a deficient number, since it is larger than the sum of its proper divisors (5286237).

100438123 is an equidigital number, since it uses as much as digits as its factorization.

100438123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5286236.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 100438123 is about 10021.8822084477. The cubic root of 100438123 is about 464.8357580818.

The spelling of 100438123 in words is "one hundred million, four hundred thirty-eight thousand, one hundred twenty-three".