400244821 has 8 divisors (see below), whose sum is σ = 429758784. Its totient is φ = 371394240.

The previous prime is 400244807. The next prime is 400244881. The reversal of 400244821 is 128442004.

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

It is not a de Polignac number, because 400244821 - 2²⁷ = 266027093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400244881) 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, 164595 + ... + 167008.

It is an arithmetic number, because the mean of its divisors is an integer number (53719848).

Almost surely, 2^400244821 is an apocalyptic number.

It is an amenable number.

400244821 is a deficient number, since it is larger than the sum of its proper divisors (29513963).

400244821 is a wasteful number, since it uses less digits than its factorization.

400244821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331691.

The product of its (nonzero) digits is 2048, while the sum is 25.

The square root of 400244821 is about 20006.1195887658. The cubic root of 400244821 is about 736.9565904496.

Adding to 400244821 its reverse (128442004), we get a palindrome (528686825).

The spelling of 400244821 in words is "four hundred million, two hundred forty-four thousand, eight hundred twenty-one".