78406 has 8 divisors (see below), whose sum is σ = 118800. Its totient is φ = 38808.

The previous prime is 78401. The next prime is 78427. The reversal of 78406 is 60487.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78406² = 12295001672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78401) by changing a digit.

78406 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 (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 295 + ... + 493.

It is an arithmetic number, because the mean of its divisors is an integer number (14850).

2⁷⁸⁴⁰⁶ is an apocalyptic number.

78406 is a deficient number, since it is larger than the sum of its proper divisors (40394).

78406 is a wasteful number, since it uses less digits than its factorization.

78406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 78406 is about 280.0107140807. The cubic root of 78406 is about 42.8005910187.

It can be divided in two parts, 78 and 406, that added together give a palindrome (484).

The spelling of 78406 in words is "seventy-eight thousand, four hundred six".