55906 has 4 divisors (see below), whose sum is σ = 83862. Its totient is φ = 27952.

The previous prime is 55903. The next prime is 55921. The reversal of 55906 is 60955.

It is a happy number.

55906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 30625 + 25281 = 175^2 + 159^2 .

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (55901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13975 + ... + 13978.

2⁵⁵⁹⁰⁶ is an apocalyptic number.

55906 is a deficient number, since it is larger than the sum of its proper divisors (27956).

55906 is a wasteful number, since it uses less digits than its factorization.

55906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27955.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 55906 is about 236.4444966583. Note that the first 4 decimals coincide. The cubic root of 55906 is about 38.2372050559.

It can be divided in two parts, 55 and 906, that added together give a square (961 = 31²).

The spelling of 55906 in words is "fifty-five thousand, nine hundred six".