400011423 has 32 divisors (see below), whose sum is σ = 637977600. Its totient is φ = 217975296.

The previous prime is 400011397. The next prime is 400011439. The reversal of 400011423 is 324110004.

It is not a de Polignac number, because 400011423 - 2⁹ = 400010911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400011473) 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 in 31 ways as a sum of consecutive naturals, for example, 186823 + ... + 188951.

It is an arithmetic number, because the mean of its divisors is an integer number (19936800).

Almost surely, 2^400011423 is an apocalyptic number.

400011423 is a deficient number, since it is larger than the sum of its proper divisors (237966177).

400011423 is a wasteful number, since it uses less digits than its factorization.

400011423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2551.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 400011423 is about 20000.2855729612. The cubic root of 400011423 is about 736.8133134433.

Adding to 400011423 its reverse (324110004), we get a palindrome (724121427).

The spelling of 400011423 in words is "four hundred million, eleven thousand, four hundred twenty-three".