16438005 has 16 divisors (see below), whose sum is σ = 29223360. Its totient is φ = 8766864.

The previous prime is 16437989. The next prime is 16438039. The reversal of 16438005 is 50083461.

It is not a de Polignac number, because 16438005 - 2⁴ = 16437989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 16438005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60747 + ... + 61016.

It is an arithmetic number, because the mean of its divisors is an integer number (1826460).

Almost surely, 2^16438005 is an apocalyptic number.

16438005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16438005 is a deficient number, since it is larger than the sum of its proper divisors (12785355).

16438005 is a wasteful number, since it uses less digits than its factorization.

16438005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121777 (or 121771 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 16438005 is about 4054.3809638464. The cubic root of 16438005 is about 254.2629234388.

The spelling of 16438005 in words is "sixteen million, four hundred thirty-eight thousand, five".