400479728 has 40 divisors (see below), whose sum is σ = 860837760. Its totient is φ = 178946240.

The previous prime is 400479719. The next prime is 400479733. The reversal of 400479728 is 827974004.

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 7 ways as a sum of consecutive naturals, for example, 8900 + ... + 29667.

It is an arithmetic number, because the mean of its divisors is an integer number (21520944).

Almost surely, 2^400479728 is an apocalyptic number.

It is an amenable number.

400479728 is an abundant number, since it is smaller than the sum of its proper divisors (460358032).

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

400479728 is a wasteful number, since it uses less digits than its factorization.

400479728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38645 (or 38639 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 400479728 is about 20011.9896062336. The cubic root of 400479728 is about 737.1007375615.

The spelling of 400479728 in words is "four hundred million, four hundred seventy-nine thousand, seven hundred twenty-eight".