16406401 has 4 divisors (see below), whose sum is σ = 17897904. Its totient is φ = 14914900.

The previous prime is 16406393. The next prime is 16406407. The reversal of 16406401 is 10460461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 16406401 - 2³ = 16406393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16406407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 745735 + ... + 745756.

It is an arithmetic number, because the mean of its divisors is an integer number (4474476).

Almost surely, 2^16406401 is an apocalyptic number.

16406401 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16406401 is a deficient number, since it is larger than the sum of its proper divisors (1491503).

16406401 is a wasteful number, since it uses less digits than its factorization.

16406401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1491502.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 16406401 is about 4050.4815763067. The cubic root of 16406401 is about 254.0998687612.

Adding to 16406401 its reverse (10460461), we get a palindrome (26866862).

It can be divided in two parts, 16406 and 401, that added together give a 5-th power (16807 = 7⁵).

The spelling of 16406401 in words is "sixteen million, four hundred six thousand, four hundred one".