400421205 has 16 divisors (see below), whose sum is σ = 711860160. Its totient is φ = 213557904.

The previous prime is 400421167. The next prime is 400421227. The reversal of 400421205 is 502124004.

400421205 is a `hidden beast` number, since 40 + 0 + 421 + 205 = 666.

It is not a de Polignac number, because 400421205 - 2⁹ = 400420693 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 1482907 + ... + 1483176.

It is an arithmetic number, because the mean of its divisors is an integer number (44491260).

Almost surely, 2^400421205 is an apocalyptic number.

400421205 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

400421205 is a deficient number, since it is larger than the sum of its proper divisors (311438955).

400421205 is a wasteful number, since it uses less digits than its factorization.

400421205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2966097 (or 2966091 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 400421205 is about 20010.5273543702. The cubic root of 400421205 is about 737.0648310849.

Adding to 400421205 its reverse (502124004), we get a palindrome (902545209).

The spelling of 400421205 in words is "four hundred million, four hundred twenty-one thousand, two hundred five".