16406 has 8 divisors (see below), whose sum is σ = 26544. Its totient is φ = 7560.

The previous prime is 16381. The next prime is 16411. The reversal of 16406 is 60461.

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

It is a plaindrome in base 9.

It is a nialpdrome in base 7 and base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 290 + ... + 341.

It is an arithmetic number, because the mean of its divisors is an integer number (3318).

2¹⁶⁴⁰⁶ is an apocalyptic number.

16406 is a deficient number, since it is larger than the sum of its proper divisors (10138).

16406 is a wasteful number, since it uses less digits than its factorization.

16406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 16406 is about 128.0859086707. The cubic root of 16406 is about 25.4097798535.

Adding to 16406 its reverse (60461), we get a palindrome (76867).

The spelling of 16406 in words is "sixteen thousand, four hundred six".