400559 has 2 divisors, whose sum is σ = 400560. Its totient is φ = 400558.

The previous prime is 400523. The next prime is 400579. The reversal of 400559 is 955004.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400559 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200279 + 200280.

It is an arithmetic number, because the mean of its divisors is an integer number (200280).

2⁴⁰⁰⁵⁵⁹ is an apocalyptic number.

400559 is a deficient number, since it is larger than the sum of its proper divisors (1).

400559 is an equidigital number, since it uses as much as digits as its factorization.

400559 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 400559 is about 632.8973060458. The cubic root of 400559 is about 73.7149368899.

It can be divided in two parts, 400 and 559, that added together give a palindrome (959).

The spelling of 400559 in words is "four hundred thousand, five hundred fifty-nine".