400432020 has 24 divisors (see below), whose sum is σ = 1121209824. Its totient is φ = 106781856.

The previous prime is 400432009. The next prime is 400432037. The reversal of 400432020 is 20234004.

It is a happy number.

400432020 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 3336874 + ... + 3336993.

It is an arithmetic number, because the mean of its divisors is an integer number (46717076).

Almost surely, 2^400432020 is an apocalyptic number.

It is an amenable number.

400432020 is an abundant number, since it is smaller than the sum of its proper divisors (720777804).

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

400432020 is a wasteful number, since it uses less digits than its factorization.

400432020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6673879 (or 6673877 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 400432020 is about 20010.7975853038. The cubic root of 400432020 is about 737.0714668344.

Adding to 400432020 its reverse (20234004), we get a palindrome (420666024).

The spelling of 400432020 in words is "four hundred million, four hundred thirty-two thousand, twenty".