400128792 has 64 divisors (see below), whose sum is σ = 1192942080. Its totient is φ = 109350912.

The previous prime is 400128731. The next prime is 400128793. The reversal of 400128792 is 297821004.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400128793) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 47913 + ... + 55640.

It is an arithmetic number, because the mean of its divisors is an integer number (18639720).

Almost surely, 2^400128792 is an apocalyptic number.

400128792 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

It is an amenable number.

400128792 is an abundant number, since it is smaller than the sum of its proper divisors (792813288).

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

400128792 is a wasteful number, since it uses less digits than its factorization.

400128792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103592 (or 103588 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 400128792 is about 20003.2195408639. The cubic root of 400128792 is about 736.8853702064.

Adding to 400128792 its reverse (297821004), we get a palindrome (697949796).

The spelling of 400128792 in words is "four hundred million, one hundred twenty-eight thousand, seven hundred ninety-two".