400021330 has 8 divisors (see below), whose sum is σ = 720038412. Its totient is φ = 160008528.

The previous prime is 400021309. The next prime is 400021333. The reversal of 400021330 is 33120004.

It can be written as a sum of positive squares in 2 ways, for example, as 381694369 + 18326961 = 19537^2 + 4281^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 400021330.

It is not an unprimeable number, because it can be changed into a prime (400021333) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 20001057 + ... + 20001076.

Almost surely, 2^400021330 is an apocalyptic number.

400021330 is a deficient number, since it is larger than the sum of its proper divisors (320017082).

400021330 is a wasteful number, since it uses less digits than its factorization.

400021330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40002140.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 400021330 is about 20000.5332428913. The cubic root of 400021330 is about 736.8193962273.

Adding to 400021330 its reverse (33120004), we get a palindrome (433141334).

The spelling of 400021330 in words is "four hundred million, twenty-one thousand, three hundred thirty".