855638 has 12 divisors (see below), whose sum is σ = 1493172. Its totient is φ = 366660.

The previous prime is 855619. The next prime is 855641. The reversal of 855638 is 836558.

855638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 855598 and 855607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4268 + ... + 4463.

It is an arithmetic number, because the mean of its divisors is an integer number (124431).

2⁸⁵⁵⁶³⁸ is an apocalyptic number.

855638 is a deficient number, since it is larger than the sum of its proper divisors (637534).

855638 is a wasteful number, since it uses less digits than its factorization.

855638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8747 (or 8740 counting only the distinct ones).

The product of its digits is 28800, while the sum is 35.

The square root of 855638 is about 925.0070270003. The cubic root of 855638 is about 94.9358015015.

It can be divided in two parts, 855 and 638, that multiplied together give a triangular number (545490 = T₁₀₄₄).

The spelling of 855638 in words is "eight hundred fifty-five thousand, six hundred thirty-eight".