400403123 has 2 divisors, whose sum is σ = 400403124. Its totient is φ = 400403122.

The previous prime is 400403119. The next prime is 400403149. The reversal of 400403123 is 321304004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400403123 - 2² = 400403119 is a prime.

It is not a weakly prime, because it can be changed into another prime (403403123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200201561 + 200201562.

It is an arithmetic number, because the mean of its divisors is an integer number (200201562).

Almost surely, 2^400403123 is an apocalyptic number.

400403123 is a deficient number, since it is larger than the sum of its proper divisors (1).

400403123 is an equidigital number, since it uses as much as digits as its factorization.

400403123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 400403123 is about 20010.0755370888. The cubic root of 400403123 is about 737.0537362622.

Adding to 400403123 its reverse (321304004), we get a palindrome (721707127).

The spelling of 400403123 in words is "four hundred million, four hundred three thousand, one hundred twenty-three".