400520063 has 4 divisors (see below), whose sum is σ = 400784568. Its totient is φ = 400255560.

The previous prime is 400520059. The next prime is 400520077. The reversal of 400520063 is 360025004.

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

It is a cyclic number.

It is not a de Polignac number, because 400520063 - 2² = 400520059 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400520563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129968 + ... + 133013.

It is an arithmetic number, because the mean of its divisors is an integer number (100196142).

Almost surely, 2^400520063 is an apocalyptic number.

400520063 is a deficient number, since it is larger than the sum of its proper divisors (264505).

400520063 is a wasteful number, since it uses less digits than its factorization.

400520063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264504.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 400520063 is about 20012.9973517212. The cubic root of 400520063 is about 737.1254828508.

Adding to 400520063 its reverse (360025004), we get a palindrome (760545067).

The spelling of 400520063 in words is "four hundred million, five hundred twenty thousand, sixty-three".