16621944 has 16 divisors (see below), whose sum is σ = 41554920. Its totient is φ = 5540640.

The previous prime is 16621897. The next prime is 16621949. The reversal of 16621944 is 44912661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16621949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346267 + ... + 346314.

Almost surely, 2^16621944 is an apocalyptic number.

It is an amenable number.

16621944 is an abundant number, since it is smaller than the sum of its proper divisors (24932976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16621944 is a wasteful number, since it uses less digits than its factorization.

16621944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692590 (or 692586 counting only the distinct ones).

The product of its digits is 10368, while the sum is 33.

The square root of 16621944 is about 4077.0018395875. The cubic root of 16621944 is about 255.2077967895.

The spelling of 16621944 in words is "sixteen million, six hundred twenty-one thousand, nine hundred forty-four".