400123 has 2 divisors, whose sum is σ = 400124. Its totient is φ = 400122.

The previous prime is 400109. The next prime is 400151. The reversal of 400123 is 321004.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400123 is a prime.

400123 is a modest number, since divided by 123 gives 4 as remainder.

It is not a weakly prime, because it can be changed into another prime (400523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200061 + 200062.

It is an arithmetic number, because the mean of its divisors is an integer number (200062).

2⁴⁰⁰¹²³ is an apocalyptic number.

400123 is a deficient number, since it is larger than the sum of its proper divisors (1).

400123 is an equidigital number, since it uses as much as digits as its factorization.

400123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 400123 is about 632.5527645975. The cubic root of 400123 is about 73.6881814634.

Adding to 400123 its reverse (321004), we get a palindrome (721127).

The spelling of 400123 in words is "four hundred thousand, one hundred twenty-three", and thus it is an iban number.