40340155243 has 4 divisors (see below), whose sum is σ = 40358078488. Its totient is φ = 40322232000.

The previous prime is 40340155231. The next prime is 40340155259. The reversal of 40340155243 is 34255104304.

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 40340155243 - 2²⁵ = 40306600811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40340555243) 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, 8958246 + ... + 8962747.

It is an arithmetic number, because the mean of its divisors is an integer number (10089519622).

Almost surely, 2^40340155243 is an apocalyptic number.

40340155243 is a deficient number, since it is larger than the sum of its proper divisors (17923245).

40340155243 is a wasteful number, since it uses less digits than its factorization.

40340155243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17923244.

The product of its (nonzero) digits is 28800, while the sum is 31.

Adding to 40340155243 its reverse (34255104304), we get a palindrome (74595259547).

The spelling of 40340155243 in words is "forty billion, three hundred forty million, one hundred fifty-five thousand, two hundred forty-three".