51406 has 4 divisors (see below), whose sum is σ = 77112. Its totient is φ = 25702.

The previous prime is 51383. The next prime is 51407. The reversal of 51406 is 60415.

51406 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 is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 51406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51407) by changing a digit.

51406 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12850 + ... + 12853.

It is an arithmetic number, because the mean of its divisors is an integer number (19278).

2⁵¹⁴⁰⁶ is an apocalyptic number.

51406 is a deficient number, since it is larger than the sum of its proper divisors (25706).

51406 is a wasteful number, since it uses less digits than its factorization.

51406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25705.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 51406 is about 226.7289130217. The cubic root of 51406 is about 37.1824444084.

Subtracting 51406 from its reverse (60415), we obtain a palindrome (9009).

It can be divided in two parts, 51 and 406, that multiplied together give a triangular number (20706 = T₂₀₃).

The spelling of 51406 in words is "fifty-one thousand, four hundred six".