16405855 has 4 divisors (see below), whose sum is σ = 19687032. Its totient is φ = 13124680.

The previous prime is 16405853. The next prime is 16405859. The reversal of 16405855 is 55850461.

It is a happy number.

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

It is not a de Polignac number, because 16405855 - 2¹ = 16405853 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a self number, because there is not a number n which added to its sum of digits gives 16405855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16405853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1640581 + ... + 1640590.

It is an arithmetic number, because the mean of its divisors is an integer number (4921758).

Almost surely, 2^16405855 is an apocalyptic number.

16405855 is a deficient number, since it is larger than the sum of its proper divisors (3281177).

16405855 is an equidigital number, since it uses as much as digits as its factorization.

16405855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3281176.

The product of its (nonzero) digits is 24000, while the sum is 34.

The square root of 16405855 is about 4050.4141763528. The cubic root of 16405855 is about 254.0970499413.

The spelling of 16405855 in words is "sixteen million, four hundred five thousand, eight hundred fifty-five".