16745821 has 8 divisors (see below), whose sum is σ = 17794080. Its totient is φ = 15714288.

The previous prime is 16745819. The next prime is 16745879. The reversal of 16745821 is 12854761.

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

It is a cyclic number.

It is not a de Polignac number, because 16745821 - 2¹ = 16745819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16745891) 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, 2086 + ... + 6151.

It is an arithmetic number, because the mean of its divisors is an integer number (2224260).

Almost surely, 2^16745821 is an apocalyptic number.

It is an amenable number.

16745821 is a deficient number, since it is larger than the sum of its proper divisors (1048259).

16745821 is a wasteful number, since it uses less digits than its factorization.

16745821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8363.

The product of its digits is 13440, while the sum is 34.

The square root of 16745821 is about 4092.1658079799. The cubic root of 16745821 is about 255.8402170644.

The spelling of 16745821 in words is "sixteen million, seven hundred forty-five thousand, eight hundred twenty-one".