400322421 has 6 divisors (see below), whose sum is σ = 578243510. Its totient is φ = 266881608.

The previous prime is 400322413. The next prime is 400322423. The reversal of 400322421 is 124223004.

It can be written as a sum of positive squares in only one way, i.e., 311699025 + 88623396 = 17655^2 + 9414^2 .

It is not a de Polignac number, because 400322421 - 2³ = 400322413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400322394 and 400322403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400322423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22240126 + ... + 22240143.

Almost surely, 2^400322421 is an apocalyptic number.

It is an amenable number.

400322421 is a deficient number, since it is larger than the sum of its proper divisors (177921089).

400322421 is a wasteful number, since it uses less digits than its factorization.

400322421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44480275 (or 44480272 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 400322421 is about 20008.0589013527. The cubic root of 400322421 is about 737.0042147476.

Adding to 400322421 its reverse (124223004), we get a palindrome (524545425).

The spelling of 400322421 in words is "four hundred million, three hundred twenty-two thousand, four hundred twenty-one".