400021323 has 16 divisors (see below), whose sum is σ = 575049216. Its totient is φ = 245884320.

The previous prime is 400021309. The next prime is 400021333. The reversal of 400021323 is 323120004.

It is not a de Polignac number, because 400021323 - 2⁵ = 400021291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (400021333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31518 + ... + 42348.

It is an arithmetic number, because the mean of its divisors is an integer number (35940576).

Almost surely, 2^400021323 is an apocalyptic number.

400021323 is a deficient number, since it is larger than the sum of its proper divisors (175027893).

400021323 is a wasteful number, since it uses less digits than its factorization.

400021323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11794.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 400021323 is about 20000.5330678960. The cubic root of 400021323 is about 736.8193919294.

Adding to 400021323 its reverse (323120004), we get a palindrome (723141327).

The spelling of 400021323 in words is "four hundred million, twenty-one thousand, three hundred twenty-three".