400042032 has 40 divisors (see below), whose sum is σ = 1112939184. Its totient is φ = 123089664.

The previous prime is 400042031. The next prime is 400042061. The reversal of 400042032 is 230240004.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (400042031) 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, 319923 + ... + 321170.

Almost surely, 2^400042032 is an apocalyptic number.

It is an amenable number.

400042032 is an abundant number, since it is smaller than the sum of its proper divisors (712897152).

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

400042032 is a wasteful number, since it uses less digits than its factorization.

400042032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641117 (or 641111 counting only the distinct ones).

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

The square root of 400042032 is about 20001.0507723969. The cubic root of 400042032 is about 736.8321066928.

Adding to 400042032 its reverse (230240004), we get a palindrome (630282036).

The spelling of 400042032 in words is "four hundred million, forty-two thousand, thirty-two".