400128470 has 64 divisors (see below), whose sum is σ = 886726656. Its totient is φ = 126973440.

The previous prime is 400128451. The next prime is 400128481. The reversal of 400128470 is 74821004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45902 + ... + 53918.

It is an arithmetic number, because the mean of its divisors is an integer number (13855104).

Almost surely, 2^400128470 is an apocalyptic number.

400128470 is an abundant number, since it is smaller than the sum of its proper divisors (486598186).

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

400128470 is a wasteful number, since it uses less digits than its factorization.

400128470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8085.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 400128470 is about 20003.2114921580. The cubic root of 400128470 is about 736.8851725391.

Adding to 400128470 its reverse (74821004), we get a palindrome (474949474).

The spelling of 400128470 in words is "four hundred million, one hundred twenty-eight thousand, four hundred seventy".