40123123 has 4 divisors (see below), whose sum is σ = 40137048. Its totient is φ = 40109200.

The previous prime is 40123121. The next prime is 40123141. The reversal of 40123123 is 32132104.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 40123123 - 2¹ = 40123121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40123097 and 40123106.

It is not an unprimeable number, because it can be changed into a prime (40123121) 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, 853 + ... + 8998.

It is an arithmetic number, because the mean of its divisors is an integer number (10034262).

Almost surely, 2^40123123 is an apocalyptic number.

40123123 is a deficient number, since it is larger than the sum of its proper divisors (13925).

40123123 is an equidigital number, since it uses as much as digits as its factorization.

40123123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13924.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 40123123 is about 6334.2815693652. The cubic root of 40123123 is about 342.3457255362.

Adding to 40123123 its reverse (32132104), we get a palindrome (72255227).

The spelling of 40123123 in words is "forty million, one hundred twenty-three thousand, one hundred twenty-three".