400800407923 has 2 divisors, whose sum is σ = 400800407924. Its totient is φ = 400800407922.

The previous prime is 400800407921. The next prime is 400800408011. The reversal of 400800407923 is 329704008004.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400800407923 - 2¹ = 400800407921 is a prime.

Together with 400800407921, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (400800407921) 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, 200400203961 + 200400203962.

It is an arithmetic number, because the mean of its divisors is an integer number (200400203962).

Almost surely, 2^400800407923 is an apocalyptic number.

400800407923 is a deficient number, since it is larger than the sum of its proper divisors (1).

400800407923 is an equidigital number, since it uses as much as digits as its factorization.

400800407923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 37.

The spelling of 400800407923 in words is "four hundred billion, eight hundred million, four hundred seven thousand, nine hundred twenty-three".