16445621 has 8 divisors (see below), whose sum is σ = 18064320. Its totient is φ = 14902272.

The previous prime is 16445603. The next prime is 16445623. The reversal of 16445621 is 12654461.

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 16445621 - 2⁶ = 16445557 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 (16445623) 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, 18380 + ... + 19253.

It is an arithmetic number, because the mean of its divisors is an integer number (2258040).

Almost surely, 2^16445621 is an apocalyptic number.

It is an amenable number.

16445621 is a deficient number, since it is larger than the sum of its proper divisors (1618699).

16445621 is a wasteful number, since it uses less digits than its factorization.

16445621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37675.

The product of its digits is 5760, while the sum is 29.

The square root of 16445621 is about 4055.3200860105. The cubic root of 16445621 is about 254.3021854505.

The spelling of 16445621 in words is "sixteen million, four hundred forty-five thousand, six hundred twenty-one".