400221031 has 8 divisors (see below), whose sum is σ = 463185920. Its totient is φ = 338703768.

The previous prime is 400221007. The next prime is 400221053. The reversal of 400221031 is 130122004.

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

It is a cyclic number.

It is not a de Polignac number, because 400221031 - 2⁷ = 400220903 is a prime.

It is a super-2 number, since 2×400221031² = 320353747309405922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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 (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 361311 + ... + 362416.

It is an arithmetic number, because the mean of its divisors is an integer number (57898240).

Almost surely, 2^400221031 is an apocalyptic number.

400221031 is a deficient number, since it is larger than the sum of its proper divisors (62964889).

400221031 is an equidigital number, since it uses as much as digits as its factorization.

400221031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723813.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 400221031 is about 20005.5250118561. The cubic root of 400221031 is about 736.9419889326.

Adding to 400221031 its reverse (130122004), we get a palindrome (530343035).

The spelling of 400221031 in words is "four hundred million, two hundred twenty-one thousand, thirty-one".