400423321 has 8 divisors (see below), whose sum is σ = 431978184. Its totient is φ = 369757440.

The previous prime is 400423313. The next prime is 400423357. The reversal of 400423321 is 123324004.

It can be written as a sum of positive squares in 4 ways, for example, as 189447696 + 210975625 = 13764^2 + 14525^2 .

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 400423321 - 2³ = 400423313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400423301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221310 + ... + 223111.

It is an arithmetic number, because the mean of its divisors is an integer number (53997273).

Almost surely, 2^400423321 is an apocalyptic number.

It is an amenable number.

400423321 is a deficient number, since it is larger than the sum of its proper divisors (31554863).

400423321 is a wasteful number, since it uses less digits than its factorization.

400423321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444491.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 400423321 is about 20010.5802264702. The cubic root of 400423321 is about 737.0661294065.

Adding to 400423321 its reverse (123324004), we get a palindrome (523747325).

The spelling of 400423321 in words is "four hundred million, four hundred twenty-three thousand, three hundred twenty-one".