400048400 has 30 divisors (see below), whose sum is σ = 961117242. Its totient is φ = 160019200.

The previous prime is 400048391. The next prime is 400048409. The reversal of 400048400 is 4840004.

It is an interprime number because it is at equal distance from previous prime (400048391) and next prime (400048409).

It can be written as a sum of positive squares in 3 ways, for example, as 139806976 + 260241424 = 11824^2 + 16132^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (400048409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 499661 + ... + 500460.

Almost surely, 2^400048400 is an apocalyptic number.

400048400 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400048400 is an abundant number, since it is smaller than the sum of its proper divisors (561068842).

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

400048400 is a wasteful number, since it uses less digits than its factorization.

400048400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000139 (or 1000128 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 400048400 is about 20001.2099633997. The cubic root of 400048400 is about 736.8360163836.

Adding to 400048400 its reverse (4840004), we get a palindrome (404888404).

The spelling of 400048400 in words is "four hundred million, forty-eight thousand, four hundred".