400221004 has 24 divisors (see below), whose sum is σ = 743123808. Its totient is φ = 187948800.

The previous prime is 400221001. The next prime is 400221007. The reversal of 400221004 is 400122004.

It is an interprime number because it is at equal distance from previous prime (400221001) and next prime (400221007).

It is not an unprimeable number, because it can be changed into a prime (400221001) 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 7 ways as a sum of consecutive naturals, for example, 28354 + ... + 40054.

It is an arithmetic number, because the mean of its divisors is an integer number (30963492).

Almost surely, 2^400221004 is an apocalyptic number.

It is an amenable number.

400221004 is a deficient number, since it is larger than the sum of its proper divisors (342902804).

400221004 is a wasteful number, since it uses less digits than its factorization.

400221004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12225 (or 12223 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 400221004 is about 20005.5243370425. The cubic root of 400221004 is about 736.9419723605.

Adding to 400221004 its reverse (400122004), we get a palindrome (800343008).

The spelling of 400221004 in words is "four hundred million, two hundred twenty-one thousand, four".