16855387 has 12 divisors (see below), whose sum is σ = 17808928. Its totient is φ = 15940800.

The previous prime is 16855373. The next prime is 16855393. The reversal of 16855387 is 78355861.

It is a de Polignac number, because none of the positive numbers 2^k-16855387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16855357) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62062 + ... + 62332.

Almost surely, 2^16855387 is an apocalyptic number.

16855387 is a deficient number, since it is larger than the sum of its proper divisors (953541).

16855387 is an equidigital number, since it uses as much as digits as its factorization.

16855387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390 (or 349 counting only the distinct ones).

The product of its digits is 201600, while the sum is 43.

The square root of 16855387 is about 4105.5312689103. The cubic root of 16855387 is about 256.3969823430.

It can be divided in two parts, 168 and 55387, that added together give a palindrome (55555).

The spelling of 16855387 in words is "sixteen million, eight hundred fifty-five thousand, three hundred eighty-seven".