400398505 has 32 divisors (see below), whose sum is σ = 537788160. Its totient is φ = 284148480.

The previous prime is 400398491. The next prime is 400398527. The reversal of 400398505 is 505893004.

It is not a de Polignac number, because 400398505 - 2⁷ = 400398377 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 585894 + ... + 586576.

It is an arithmetic number, because the mean of its divisors is an integer number (16805880).

Almost surely, 2^400398505 is an apocalyptic number.

It is an amenable number.

400398505 is a deficient number, since it is larger than the sum of its proper divisors (137389655).

400398505 is a wasteful number, since it uses less digits than its factorization.

400398505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 400398505 is about 20009.9601448878. The cubic root of 400398505 is about 737.0509026785.

The spelling of 400398505 in words is "four hundred million, three hundred ninety-eight thousand, five hundred five".