40120123243 has 4 divisors (see below), whose sum is σ = 40517352288. Its totient is φ = 39722894200.

The previous prime is 40120123201. The next prime is 40120123259. The reversal of 40120123243 is 34232102104.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40120123243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40120123843) 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, 198614371 + ... + 198614572.

It is an arithmetic number, because the mean of its divisors is an integer number (10129338072).

Almost surely, 2^40120123243 is an apocalyptic number.

40120123243 is a deficient number, since it is larger than the sum of its proper divisors (397229045).

40120123243 is a wasteful number, since it uses less digits than its factorization.

40120123243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397229044.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 40120123243 its reverse (34232102104), we get a palindrome (74352225347).

The spelling of 40120123243 in words is "forty billion, one hundred twenty million, one hundred twenty-three thousand, two hundred forty-three".