16003645 has 24 divisors (see below), whose sum is σ = 22637664. Its totient is φ = 10827936.

The previous prime is 16003639. The next prime is 16003649. The reversal of 16003645 is 54630061.

It is not a de Polignac number, because 16003645 - 2¹⁷ = 15872573 is a prime.

It is a super-3 number, since 3×16003645³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16003649) 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 23 ways as a sum of consecutive naturals, for example, 19942 + ... + 20728.

It is an arithmetic number, because the mean of its divisors is an integer number (943236).

Almost surely, 2^16003645 is an apocalyptic number.

It is an amenable number.

16003645 is a deficient number, since it is larger than the sum of its proper divisors (6634019).

16003645 is an equidigital number, since it uses as much as digits as its factorization.

16003645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889 (or 882 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 16003645 is about 4000.4555990537. The cubic root of 16003645 is about 252.0033435770.

It can be divided in two parts, 1600 and 3645, that multiplied together give a cube (5832000 = 180³).

The spelling of 16003645 in words is "sixteen million, three thousand, six hundred forty-five".