400444405 has 8 divisors (see below), whose sum is σ = 483991200. Its totient is φ = 318050256.

The previous prime is 400444403. The next prime is 400444409. The reversal of 400444405 is 504444004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400444405 - 2¹ = 400444403 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400444405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400444403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287395 + ... + 288784.

It is an arithmetic number, because the mean of its divisors is an integer number (60498900).

Almost surely, 2^400444405 is an apocalyptic number.

It is an amenable number.

400444405 is a deficient number, since it is larger than the sum of its proper divisors (83546795).

400444405 is a wasteful number, since it uses less digits than its factorization.

400444405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576323.

The product of its (nonzero) digits is 5120, while the sum is 25.

The square root of 400444405 is about 20011.1070408411. The cubic root of 400444405 is about 737.0790657405.

Adding to 400444405 its reverse (504444004), we get a palindrome (904888409).

The spelling of 400444405 in words is "four hundred million, four hundred forty-four thousand, four hundred five".