400320105 has 16 divisors (see below), whose sum is σ = 656135424. Its totient is φ = 208296320.

The previous prime is 400320073. The next prime is 400320113. The reversal of 400320105 is 501023004.

400320105 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 400320105 - 2⁵ = 400320073 is a prime.

It is a super-2 number, since 2×400320105² = 320512372934422050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 324849 + ... + 326078.

It is an arithmetic number, because the mean of its divisors is an integer number (41008464).

Almost surely, 2^400320105 is an apocalyptic number.

It is an amenable number.

400320105 is a deficient number, since it is larger than the sum of its proper divisors (255815319).

400320105 is a wasteful number, since it uses less digits than its factorization.

400320105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650976.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 400320105 is about 20008.0010245901. The cubic root of 400320105 is about 737.0027934723.

Adding to 400320105 its reverse (501023004), we get a palindrome (901343109).

The spelling of 400320105 in words is "four hundred million, three hundred twenty thousand, one hundred five".