400401085 has 16 divisors (see below), whose sum is σ = 581423616. Its totient is φ = 258409728.

The previous prime is 400401083. The next prime is 400401091. The reversal of 400401085 is 580104004.

It is a cyclic number.

It is not a de Polignac number, because 400401085 - 2¹ = 400401083 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 (400401083) 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 15 ways as a sum of consecutive naturals, for example, 335877 + ... + 337066.

It is an arithmetic number, because the mean of its divisors is an integer number (36338976).

Almost surely, 2^400401085 is an apocalyptic number.

It is an amenable number.

400401085 is a deficient number, since it is larger than the sum of its proper divisors (181022531).

400401085 is a wasteful number, since it uses less digits than its factorization.

400401085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672972.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 400401085 is about 20010.0246126785. The cubic root of 400401085 is about 737.0524857574.

Adding to 400401085 its reverse (580104004), we get a palindrome (980505089).

The spelling of 400401085 in words is "four hundred million, four hundred one thousand, eighty-five".