40438123 has 4 divisors (see below), whose sum is σ = 44114328. Its totient is φ = 36761920.

The previous prime is 40438081. The next prime is 40438141. The reversal of 40438123 is 32183404.

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 40438123 - 2²¹ = 38340971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40448123) 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, 1838086 + ... + 1838107.

It is an arithmetic number, because the mean of its divisors is an integer number (11028582).

Almost surely, 2^40438123 is an apocalyptic number.

40438123 is a deficient number, since it is larger than the sum of its proper divisors (3676205).

40438123 is a wasteful number, since it uses less digits than its factorization.

40438123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3676204.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 40438123 is about 6359.0976561144. The cubic root of 40438123 is about 343.2392910707.

It can be divided in two parts, 404381 and 23, that added together give a palindrome (404404).

The spelling of 40438123 in words is "forty million, four hundred thirty-eight thousand, one hundred twenty-three".