400002823 has 8 divisors (see below), whose sum is σ = 436655376. Its totient is φ = 363398400.

The previous prime is 400002817. The next prime is 400002857. The reversal of 400002823 is 328200004.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400002823 - 2⁹ = 400002311 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 400002823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400002023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6615 + ... + 29047.

It is an arithmetic number, because the mean of its divisors is an integer number (54581922).

Almost surely, 2^400002823 is an apocalyptic number.

400002823 is a deficient number, since it is larger than the sum of its proper divisors (36652553).

400002823 is a wasteful number, since it uses less digits than its factorization.

400002823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24065.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 400002823 is about 20000.0705748755. The cubic root of 400002823 is about 736.8080330608.

Adding to 400002823 its reverse (328200004), we get a palindrome (728202827).

The spelling of 400002823 in words is "four hundred million, two thousand, eight hundred twenty-three".