16871840 has 24 divisors (see below), whose sum is σ = 39860100. Its totient is φ = 6748672.

The previous prime is 16871821. The next prime is 16871851. The reversal of 16871840 is 4817861.

It can be written as a sum of positive squares in 2 ways, for example, as 16613776 + 258064 = 4076^2 + 508^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16871840.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52565 + ... + 52884.

Almost surely, 2^16871840 is an apocalyptic number.

16871840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16871840 is an abundant number, since it is smaller than the sum of its proper divisors (22988260).

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

16871840 is a wasteful number, since it uses less digits than its factorization.

16871840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105464 (or 105456 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 16871840 is about 4107.5345403295. The cubic root of 16871840 is about 256.4803805606.

The spelling of 16871840 in words is "sixteen million, eight hundred seventy-one thousand, eight hundred forty".