400442320 has 40 divisors (see below), whose sum is σ = 937752480. Its totient is φ = 159020160.

The previous prime is 400442311. The next prime is 400442321. The reversal of 400442320 is 23244004.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400442321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6886 + ... + 29125.

It is an arithmetic number, because the mean of its divisors is an integer number (23443812).

Almost surely, 2^400442320 is an apocalyptic number.

400442320 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400442320 is an abundant number, since it is smaller than the sum of its proper divisors (537310160).

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

400442320 is a wasteful number, since it uses less digits than its factorization.

400442320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36163 (or 36157 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 400442320 is about 20011.0549447049. The cubic root of 400442320 is about 737.0777864847.

Adding to 400442320 its reverse (23244004), we get a palindrome (423686324).

The spelling of 400442320 in words is "four hundred million, four hundred forty-two thousand, three hundred twenty".