400444403 has 2 divisors, whose sum is σ = 400444404. Its totient is φ = 400444402.

The previous prime is 400444381. The next prime is 400444409. The reversal of 400444403 is 304444004.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400444403 is a prime.

It is not a weakly prime, because it can be changed into another prime (400444409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200222201 + 200222202.

It is an arithmetic number, because the mean of its divisors is an integer number (200222202).

Almost surely, 2^400444403 is an apocalyptic number.

400444403 is a deficient number, since it is larger than the sum of its proper divisors (1).

400444403 is an equidigital number, since it uses as much as digits as its factorization.

400444403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 23.

The square root of 400444403 is about 20011.1069908688. The cubic root of 400444403 is about 737.0790645134.

Adding to 400444403 its reverse (304444004), we get a palindrome (704888407).

The spelling of 400444403 in words is "four hundred million, four hundred forty-four thousand, four hundred three".