400022155 has 24 divisors (see below), whose sum is σ = 550387872. Its totient is φ = 278014464.

The previous prime is 400022153. The next prime is 400022167. The reversal of 400022155 is 551220004.

It is not a de Polignac number, because 400022155 - 2¹ = 400022153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400022153) 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 23 ways as a sum of consecutive naturals, for example, 442 + ... + 28288.

It is an arithmetic number, because the mean of its divisors is an integer number (22932828).

Almost surely, 2^400022155 is an apocalyptic number.

400022155 is a deficient number, since it is larger than the sum of its proper divisors (150365717).

400022155 is a wasteful number, since it uses less digits than its factorization.

400022155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27895 (or 27882 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 400022155 is about 20000.5538673308. The cubic root of 400022155 is about 736.8199027632.

Adding to 400022155 its reverse (551220004), we get a palindrome (951242159).

The spelling of 400022155 in words is "four hundred million, twenty-two thousand, one hundred fifty-five".