440403643 has 2 divisors, whose sum is σ = 440403644. Its totient is φ = 440403642.

The previous prime is 440403629. The next prime is 440403661. The reversal of 440403643 is 346304044.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 440403643 - 2⁵ = 440403611 is a prime.

It is not a weakly prime, because it can be changed into another prime (440403043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220201821 + 220201822.

It is an arithmetic number, because the mean of its divisors is an integer number (220201822).

Almost surely, 2^440403643 is an apocalyptic number.

440403643 is a deficient number, since it is larger than the sum of its proper divisors (1).

440403643 is an equidigital number, since it uses as much as digits as its factorization.

440403643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 28.

The square root of 440403643 is about 20985.7962203010. The cubic root of 440403643 is about 760.8230021493.

Adding to 440403643 its reverse (346304044), we get a palindrome (786707687).

The spelling of 440403643 in words is "four hundred forty million, four hundred three thousand, six hundred forty-three".