40042123 has 8 divisors (see below), whose sum is σ = 46252080. Its totient is φ = 34260480.

The previous prime is 40042109. The next prime is 40042129. The reversal of 40042123 is 32124004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40042123 - 2¹⁷ = 39911051 is a prime.

It is a super-2 number, since 2×40042123² = 3206743228694258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40042097 and 40042106.

It is not an unprimeable number, because it can be changed into a prime (40042129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106878 + ... + 107251.

It is an arithmetic number, because the mean of its divisors is an integer number (5781510).

Almost surely, 2^40042123 is an apocalyptic number.

40042123 is a deficient number, since it is larger than the sum of its proper divisors (6209957).

40042123 is a wasteful number, since it uses less digits than its factorization.

40042123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214157.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 40042123 is about 6327.8845596297. The cubic root of 40042123 is about 342.1151960812.

Adding to 40042123 its reverse (32124004), we get a palindrome (72166127).

The spelling of 40042123 in words is "forty million, forty-two thousand, one hundred twenty-three".