400421323 has 4 divisors (see below), whose sum is σ = 401190408. Its totient is φ = 399652240.

The previous prime is 400421321. The next prime is 400421353. The reversal of 400421323 is 323124004.

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 400421323 - 2¹ = 400421321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400421323.

It is not an unprimeable number, because it can be changed into a prime (400421321) 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, 383761 + ... + 384802.

It is an arithmetic number, because the mean of its divisors is an integer number (100297602).

Almost surely, 2^400421323 is an apocalyptic number.

400421323 is a deficient number, since it is larger than the sum of its proper divisors (769085).

400421323 is an equidigital number, since it uses as much as digits as its factorization.

400421323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769084.

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

The square root of 400421323 is about 20010.5303028181. The cubic root of 400421323 is about 737.0649034867.

Adding to 400421323 its reverse (323124004), we get a palindrome (723545327).

The spelling of 400421323 in words is "four hundred million, four hundred twenty-one thousand, three hundred twenty-three".