40204243 has 2 divisors, whose sum is σ = 40204244. Its totient is φ = 40204242.

The previous prime is 40204189. The next prime is 40204259. The reversal of 40204243 is 34240204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40204243 - 2⁹ = 40203731 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40204243.

It is not a weakly prime, because it can be changed into another prime (40204543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20102121 + 20102122.

It is an arithmetic number, because the mean of its divisors is an integer number (20102122).

Almost surely, 2^40204243 is an apocalyptic number.

40204243 is a deficient number, since it is larger than the sum of its proper divisors (1).

40204243 is an equidigital number, since it uses as much as digits as its factorization.

40204243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 40204243 is about 6340.6815879683. The cubic root of 40204243 is about 342.5762857762.

Adding to 40204243 its reverse (34240204), we get a palindrome (74444447).

The spelling of 40204243 in words is "forty million, two hundred four thousand, two hundred forty-three".