40409123 has 2 divisors, whose sum is σ = 40409124. Its totient is φ = 40409122.

The previous prime is 40409113. The next prime is 40409129. The reversal of 40409123 is 32190404.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40409123 - 2⁸ = 40408867 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (40409129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20204561 + 20204562.

It is an arithmetic number, because the mean of its divisors is an integer number (20204562).

Almost surely, 2^40409123 is an apocalyptic number.

40409123 is a deficient number, since it is larger than the sum of its proper divisors (1).

40409123 is an equidigital number, since it uses as much as digits as its factorization.

40409123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 40409123 is about 6356.8170494360. The cubic root of 40409123 is about 343.1572206619.

Adding to 40409123 its reverse (32190404), we get a palindrome (72599527).

The spelling of 40409123 in words is "forty million, four hundred nine thousand, one hundred twenty-three".