400432040 has 32 divisors (see below), whose sum is σ = 912384000. Its totient is φ = 158144064.

The previous prime is 400432037. The next prime is 400432063. The reversal of 400432040 is 40234004.

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, 60200 + ... + 66519.

It is an arithmetic number, because the mean of its divisors is an integer number (28512000).

Almost surely, 2^400432040 is an apocalyptic number.

400432040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400432040 is an abundant number, since it is smaller than the sum of its proper divisors (511951960).

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

400432040 is a wasteful number, since it uses less digits than its factorization.

400432040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126809 (or 126805 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 400432040 is about 20010.7980850340. The cubic root of 400432040 is about 737.0714791057.

Adding to 400432040 its reverse (40234004), we get a palindrome (440666044).

The spelling of 400432040 in words is "four hundred million, four hundred thirty-two thousand, forty".