400322431 has 4 divisors (see below), whose sum is σ = 400648864. Its totient is φ = 399996000.

The previous prime is 400322423. The next prime is 400322441. The reversal of 400322431 is 134223004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 400322431 - 2³ = 400322423 is a prime.

It is a super-2 number, since 2×400322431² = 320516097523499522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400322399 and 400322408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400322411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161370 + ... + 163831.

It is an arithmetic number, because the mean of its divisors is an integer number (100162216).

Almost surely, 2^400322431 is an apocalyptic number.

400322431 is a deficient number, since it is larger than the sum of its proper divisors (326433).

400322431 is a wasteful number, since it uses less digits than its factorization.

400322431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326432.

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

The square root of 400322431 is about 20008.0591512520. The cubic root of 400322431 is about 737.0042208844.

Adding to 400322431 its reverse (134223004), we get a palindrome (534545435).

The spelling of 400322431 in words is "four hundred million, three hundred twenty-two thousand, four hundred thirty-one".