16855442 has 4 divisors (see below), whose sum is σ = 25283166. Its totient is φ = 8427720.

The previous prime is 16855427. The next prime is 16855457. The reversal of 16855442 is 24455861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24455861 = 4523 ⋅5407.

It is an interprime number because it is at equal distance from previous prime (16855427) and next prime (16855457).

It can be written as a sum of positive squares in only one way, i.e., 16394401 + 461041 = 4049^2 + 679^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4213859 + ... + 4213862.

Almost surely, 2^16855442 is an apocalyptic number.

16855442 is a deficient number, since it is larger than the sum of its proper divisors (8427724).

16855442 is an equidigital number, since it uses as much as digits as its factorization.

16855442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8427723.

The product of its digits is 38400, while the sum is 35.

The square root of 16855442 is about 4105.5379671853. The cubic root of 16855442 is about 256.3972612216.

The spelling of 16855442 in words is "sixteen million, eight hundred fifty-five thousand, four hundred forty-two".