40403243 has 2 divisors, whose sum is σ = 40403244. Its totient is φ = 40403242.

The previous prime is 40403201. The next prime is 40403257. The reversal of 40403243 is 34230404.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40403243 - 2⁶ = 40403179 is a prime.

It is not a weakly prime, because it can be changed into another prime (40403743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20201621 + 20201622.

It is an arithmetic number, because the mean of its divisors is an integer number (20201622).

Almost surely, 2^40403243 is an apocalyptic number.

40403243 is a deficient number, since it is larger than the sum of its proper divisors (1).

40403243 is an equidigital number, since it uses as much as digits as its factorization.

40403243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 40403243 is about 6356.3545369968. The cubic root of 40403243 is about 343.1405753915.

Adding to 40403243 its reverse (34230404), we get a palindrome (74633647).

The spelling of 40403243 in words is "forty million, four hundred three thousand, two hundred forty-three".