40540823 has 2 divisors, whose sum is σ = 40540824. Its totient is φ = 40540822.

The previous prime is 40540817. The next prime is 40540849. The reversal of 40540823 is 32804504.

It is an a-pointer prime, because the next prime (40540849) can be obtained adding 40540823 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40540823 - 2⁴ = 40540807 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40540792 and 40540801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40540883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20270411 + 20270412.

It is an arithmetic number, because the mean of its divisors is an integer number (20270412).

Almost surely, 2^40540823 is an apocalyptic number.

40540823 is a deficient number, since it is larger than the sum of its proper divisors (1).

40540823 is an equidigital number, since it uses as much as digits as its factorization.

40540823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 40540823 is about 6367.1675806437. The cubic root of 40540823 is about 343.5296183887.

The spelling of 40540823 in words is "forty million, five hundred forty thousand, eight hundred twenty-three".