400243344029 has 4 divisors (see below), whose sum is σ = 417645228576. Its totient is φ = 382841459484.

The previous prime is 400243343999. The next prime is 400243344037. The reversal of 400243344029 is 920443342004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400243344029 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400243344029.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400243304029) 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 3 ways as a sum of consecutive naturals, for example, 8700942239 + ... + 8700942284.

It is an arithmetic number, because the mean of its divisors is an integer number (104411307144).

Almost surely, 2^400243344029 is an apocalyptic number.

It is an amenable number.

400243344029 is a deficient number, since it is larger than the sum of its proper divisors (17401884547).

400243344029 is a wasteful number, since it uses less digits than its factorization.

400243344029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17401884546.

The product of its (nonzero) digits is 82944, while the sum is 35.

The spelling of 400243344029 in words is "four hundred billion, two hundred forty-three million, three hundred forty-four thousand, twenty-nine".