403861 has 2 divisors, whose sum is σ = 403862. Its totient is φ = 403860.

The previous prime is 403849. The next prime is 403867. The reversal of 403861 is 168304.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 324900 + 78961 = 570^2 + 281^2 .

It is a cyclic number.

It is not a de Polignac number, because 403861 - 2⁵ = 403829 is a prime.

It is the 636-th Hogben number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (403867) by changing a digit.

It is a nontrivial repunit in base 635.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201930 + 201931.

It is an arithmetic number, because the mean of its divisors is an integer number (201931).

2⁴⁰³⁸⁶¹ is an apocalyptic number.

It is an amenable number.

403861 is a deficient number, since it is larger than the sum of its proper divisors (1).

403861 is an equidigital number, since it uses as much as digits as its factorization.

403861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 403861 is about 635.5005900863. The cubic root of 403861 is about 73.9169386995.

The spelling of 403861 in words is "four hundred three thousand, eight hundred sixty-one".