102406 has 4 divisors (see below), whose sum is σ = 153612. Its totient is φ = 51202.

The previous prime is 102397. The next prime is 102407. The reversal of 102406 is 604201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 604201 = 13 ⋅46477.

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102407) by changing a digit.

102406 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25600 + ... + 25603.

It is an arithmetic number, because the mean of its divisors is an integer number (38403).

2¹⁰²⁴⁰⁶ is an apocalyptic number.

102406 is a deficient number, since it is larger than the sum of its proper divisors (51206).

102406 is an equidigital number, since it uses as much as digits as its factorization.

102406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51205.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 102406 is about 320.0093748627. The cubic root of 102406 is about 46.7851975491.

Adding to 102406 its reverse (604201), we get a palindrome (706607).

The spelling of 102406 in words is "one hundred two thousand, four hundred six".