16945638 has 16 divisors (see below), whose sum is σ = 34109040. Its totient is φ = 5612256.

The previous prime is 16945631. The next prime is 16945639. The reversal of 16945638 is 83654961.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 16945638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16945631) 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, 8053 + ... + 9936.

It is an arithmetic number, because the mean of its divisors is an integer number (2131815).

Almost surely, 2^16945638 is an apocalyptic number.

16945638 is an abundant number, since it is smaller than the sum of its proper divisors (17163402).

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

16945638 is a wasteful number, since it uses less digits than its factorization.

16945638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18151.

The product of its digits is 155520, while the sum is 42.

The square root of 16945638 is about 4116.5079861455. The cubic root of 16945638 is about 256.8537879489.

The spelling of 16945638 in words is "sixteen million, nine hundred forty-five thousand, six hundred thirty-eight".