400398367238 has 4 divisors (see below), whose sum is σ = 600597550860. Its totient is φ = 200199183618.

The previous prime is 400398367231. The next prime is 400398367297. The reversal of 400398367238 is 832763893004.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 400398367238.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400398367231) 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, 100099591808 + ... + 100099591811.

It is an arithmetic number, because the mean of its divisors is an integer number (150149387715).

Almost surely, 2^400398367238 is an apocalyptic number.

400398367238 is a deficient number, since it is larger than the sum of its proper divisors (200199183622).

400398367238 is a wasteful number, since it uses less digits than its factorization.

400398367238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200199183621.

The product of its (nonzero) digits is 5225472, while the sum is 53.

The spelling of 400398367238 in words is "four hundred billion, three hundred ninety-eight million, three hundred sixty-seven thousand, two hundred thirty-eight".