40397243 has 2 divisors, whose sum is σ = 40397244. Its totient is φ = 40397242.

The previous prime is 40397221. The next prime is 40397263. The reversal of 40397243 is 34279304.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40397243 - 2⁸ = 40396987 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (40397263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20198621 + 20198622.

It is an arithmetic number, because the mean of its divisors is an integer number (20198622).

Almost surely, 2^40397243 is an apocalyptic number.

40397243 is a deficient number, since it is larger than the sum of its proper divisors (1).

40397243 is an equidigital number, since it uses as much as digits as its factorization.

40397243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 40397243 is about 6355.8825508343. The cubic root of 40397243 is about 343.1235887569.

The spelling of 40397243 in words is "forty million, three hundred ninety-seven thousand, two hundred forty-three".