400838143 has 2 divisors, whose sum is σ = 400838144. Its totient is φ = 400838142.

The previous prime is 400838093. The next prime is 400838149. The reversal of 400838143 is 341838004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400838143 - 2⁹ = 400837631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400838149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200419071 + 200419072.

It is an arithmetic number, because the mean of its divisors is an integer number (200419072).

Almost surely, 2^400838143 is an apocalyptic number.

400838143 is a deficient number, since it is larger than the sum of its proper divisors (1).

400838143 is an equidigital number, since it uses as much as digits as its factorization.

400838143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 400838143 is about 20020.9426101770. The cubic root of 400838143 is about 737.3205649074.

The spelling of 400838143 in words is "four hundred million, eight hundred thirty-eight thousand, one hundred forty-three".