400423170 has 64 divisors (see below), whose sum is σ = 1102058496. Its totient is φ = 91212480.

The previous prime is 400423103. The next prime is 400423171. The reversal of 400423170 is 71324004.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (400423171) by changing a digit.

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, 61365 + ... + 67575.

It is an arithmetic number, because the mean of its divisors is an integer number (17219664).

Almost surely, 2^400423170 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400423170, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (551029248).

400423170 is an abundant number, since it is smaller than the sum of its proper divisors (701635326).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400423170 is a wasteful number, since it uses less digits than its factorization.

400423170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6535.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 400423170 is about 20010.5764534658. The cubic root of 400423170 is about 737.0660367570.

Adding to 400423170 its reverse (71324004), we get a palindrome (471747174).

The spelling of 400423170 in words is "four hundred million, four hundred twenty-three thousand, one hundred seventy".