400244003 has 4 divisors (see below), whose sum is σ = 400309488. Its totient is φ = 400178520.

The previous prime is 400243981. The next prime is 400244021. The reversal of 400244003 is 300442004.

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 400244003 - 2¹⁰ = 400242979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400244083) 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, 22508 + ... + 36153.

It is an arithmetic number, because the mean of its divisors is an integer number (100077372).

Almost surely, 2^400244003 is an apocalyptic number.

400244003 is a deficient number, since it is larger than the sum of its proper divisors (65485).

400244003 is an equidigital number, since it uses as much as digits as its factorization.

400244003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65484.

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 400244003 is about 20006.0991450108. The cubic root of 400244003 is about 736.9560883978.

Adding to 400244003 its reverse (300442004), we get a palindrome (700686007).

The spelling of 400244003 in words is "four hundred million, two hundred forty-four thousand, three".