40243187 has 2 divisors, whose sum is σ = 40243188. Its totient is φ = 40243186.

The previous prime is 40243183. The next prime is 40243193. The reversal of 40243187 is 78134204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40243187 - 2² = 40243183 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40243183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20121593 + 20121594.

It is an arithmetic number, because the mean of its divisors is an integer number (20121594).

Almost surely, 2^40243187 is an apocalyptic number.

40243187 is a deficient number, since it is larger than the sum of its proper divisors (1).

40243187 is an equidigital number, since it uses as much as digits as its factorization.

40243187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 40243187 is about 6343.7518078815. The cubic root of 40243187 is about 342.6868627078.

The spelling of 40243187 in words is "forty million, two hundred forty-three thousand, one hundred eighty-seven".