400645340723 has 8 divisors (see below), whose sum is σ = 401022884976. Its totient is φ = 400267872000.

The previous prime is 400645340717. The next prime is 400645340749. The reversal of 400645340723 is 327043546004.

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 400645340723 - 2²⁸ = 400376905267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400645340713) 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, 20987543 + ... + 21006623.

It is an arithmetic number, because the mean of its divisors is an integer number (50127860622).

Almost surely, 2^400645340723 is an apocalyptic number.

400645340723 is a deficient number, since it is larger than the sum of its proper divisors (377544253).

400645340723 is a wasteful number, since it uses less digits than its factorization.

400645340723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37765.

The product of its (nonzero) digits is 241920, while the sum is 38.

Adding to 400645340723 its reverse (327043546004), we get a palindrome (727688886727).

The spelling of 400645340723 in words is "four hundred billion, six hundred forty-five million, three hundred forty thousand, seven hundred twenty-three".