16452621 has 6 divisors (see below), whose sum is σ = 23764910. Its totient is φ = 10968408.

The previous prime is 16452607. The next prime is 16452637. The reversal of 16452621 is 12625461.

16452621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 16281225 + 171396 = 4035^2 + 414^2 .

It is not a de Polignac number, because 16452621 - 2⁵ = 16452589 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 (16452221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 914026 + ... + 914043.

Almost surely, 2^16452621 is an apocalyptic number.

It is an amenable number.

16452621 is a deficient number, since it is larger than the sum of its proper divisors (7312289).

16452621 is a wasteful number, since it uses less digits than its factorization.

16452621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1828075 (or 1828072 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 16452621 is about 4056.1830579992. The cubic root of 16452621 is about 254.3382611692.

The spelling of 16452621 in words is "sixteen million, four hundred fifty-two thousand, six hundred twenty-one".