166406 has 4 divisors (see below), whose sum is σ = 249612. Its totient is φ = 83202.

The previous prime is 166403. The next prime is 166409. The reversal of 166406 is 604661.

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

It is an interprime number because it is at equal distance from previous prime (166403) and next prime (166409).

It is a plaindrome in base 15.

It is a nialpdrome in base 6.

It is a zygodrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41600 + ... + 41603.

It is an arithmetic number, because the mean of its divisors is an integer number (62403).

2¹⁶⁶⁴⁰⁶ is an apocalyptic number.

166406 is a deficient number, since it is larger than the sum of its proper divisors (83206).

166406 is an equidigital number, since it uses as much as digits as its factorization.

166406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83205.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 166406 is about 407.9289153762. The cubic root of 166406 is about 55.0034157658.

The spelling of 166406 in words is "one hundred sixty-six thousand, four hundred six".