400440323 has 4 divisors (see below), whose sum is σ = 414248640. Its totient is φ = 386632008.

The previous prime is 400440311. The next prime is 400440343. The reversal of 400440323 is 323044004.

It is a happy number.

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 400440323 - 2¹⁶ = 400374787 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400440295 and 400440304.

It is not an unprimeable number, because it can be changed into a prime (400440343) 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, 6904115 + ... + 6904172.

It is an arithmetic number, because the mean of its divisors is an integer number (103562160).

Almost surely, 2^400440323 is an apocalyptic number.

400440323 is a deficient number, since it is larger than the sum of its proper divisors (13808317).

400440323 is a wasteful number, since it uses less digits than its factorization.

400440323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13808316.

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 400440323 is about 20011.0050472234. The cubic root of 400440323 is about 737.0765612173.

Adding to 400440323 its reverse (323044004), we get a palindrome (723484327).

The spelling of 400440323 in words is "four hundred million, four hundred forty thousand, three hundred twenty-three".