400232421 has 12 divisors (see below), whose sum is σ = 599525472. Its totient is φ = 266821452.

The previous prime is 400232387. The next prime is 400232423. The reversal of 400232421 is 124232004.

400232421 is a `hidden beast` number, since 400 + 23 + 242 + 1 = 666.

It is not a de Polignac number, because 400232421 - 2¹¹ = 400230373 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 400232394 and 400232403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400232423) 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 11 ways as a sum of consecutive naturals, for example, 823281 + ... + 823766.

It is an arithmetic number, because the mean of its divisors is an integer number (49960456).

Almost surely, 2^400232421 is an apocalyptic number.

It is an amenable number.

400232421 is a deficient number, since it is larger than the sum of its proper divisors (199293051).

400232421 is an equidigital number, since it uses as much as digits as its factorization.

400232421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1647062 (or 1647050 counting only the distinct ones).

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

The square root of 400232421 is about 20005.8096811901. The cubic root of 400232421 is about 736.9489798109.

Adding to 400232421 its reverse (124232004), we get a palindrome (524464425).

The spelling of 400232421 in words is "four hundred million, two hundred thirty-two thousand, four hundred twenty-one".