400004442 has 24 divisors (see below), whose sum is σ = 867877920. Its totient is φ = 133149960.

The previous prime is 400004419. The next prime is 400004471. The reversal of 400004442 is 244400004.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1734 + ... + 28337.

It is an arithmetic number, because the mean of its divisors is an integer number (36161580).

Almost surely, 2^400004442 is an apocalyptic number.

400004442 is an abundant number, since it is smaller than the sum of its proper divisors (467873478).

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

400004442 is a wasteful number, since it uses less digits than its factorization.

400004442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30818 (or 30815 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 400004442 is about 20000.1110496917. Note that the first 3 decimals coincide. The cubic root of 400004442 is about 736.8090271293.

Adding to 400004442 its reverse (244400004), we get a palindrome (644404446).

The spelling of 400004442 in words is "four hundred million, four thousand, four hundred forty-two".