16213645 has 8 divisors (see below), whose sum is σ = 22235904. Its totient is φ = 11117904.

The previous prime is 16213609. The next prime is 16213649. The reversal of 16213645 is 54631261.

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

It is not a de Polignac number, because 16213645 - 2¹⁹ = 15689357 is a prime.

It is a super-3 number, since 3×16213645³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16213649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231589 + ... + 231658.

It is an arithmetic number, because the mean of its divisors is an integer number (2779488).

Almost surely, 2^16213645 is an apocalyptic number.

It is an amenable number.

16213645 is a deficient number, since it is larger than the sum of its proper divisors (6022259).

16213645 is an equidigital number, since it uses as much as digits as its factorization.

16213645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463259.

The product of its digits is 4320, while the sum is 28.

The square root of 16213645 is about 4026.6170664716. The cubic root of 16213645 is about 253.1008206340.

The spelling of 16213645 in words is "sixteen million, two hundred thirteen thousand, six hundred forty-five".