400723 has 2 divisors, whose sum is σ = 400724. Its totient is φ = 400722.

The previous prime is 400721. The next prime is 400739. The reversal of 400723 is 327004.

It is an a-pointer prime, because the next prime (400739) can be obtained adding 400723 to its sum of digits (16).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400723 - 2¹ = 400721 is a prime.

Together with 400721, it forms a pair of twin primes.

400723 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 400697 and 400706.

It is not a weakly prime, because it can be changed into another prime (400721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200361 + 200362.

It is an arithmetic number, because the mean of its divisors is an integer number (200362).

2⁴⁰⁰⁷²³ is an apocalyptic number.

400723 is a deficient number, since it is larger than the sum of its proper divisors (1).

400723 is an equidigital number, since it uses as much as digits as its factorization.

400723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 16.

The square root of 400723 is about 633.0268556704. The cubic root of 400723 is about 73.7249958327.

Adding to 400723 its reverse (327004), we get a palindrome (727727).

The spelling of 400723 in words is "four hundred thousand, seven hundred twenty-three", and thus it is an iban number.