400859 has 2 divisors, whose sum is σ = 400860. Its totient is φ = 400858.

The previous prime is 400853. The next prime is 400871. The reversal of 400859 is 958004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400859 - 2¹⁶ = 335323 is a prime.

It is not a weakly prime, because it can be changed into another prime (400853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200429 + 200430.

It is an arithmetic number, because the mean of its divisors is an integer number (200430).

2⁴⁰⁰⁸⁵⁹ is an apocalyptic number.

400859 is a deficient number, since it is larger than the sum of its proper divisors (1).

400859 is an equidigital number, since it uses as much as digits as its factorization.

400859 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 400859 is about 633.1342669608. The cubic root of 400859 is about 73.7333353135.

The spelling of 400859 in words is "four hundred thousand, eight hundred fifty-nine".