16851540 has 24 divisors (see below), whose sum is σ = 47184480. Its totient is φ = 4493728.

The previous prime is 16851517. The next prime is 16851551. The reversal of 16851540 is 4515861.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 16851498 and 16851507.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140370 + ... + 140489.

It is an arithmetic number, because the mean of its divisors is an integer number (1966020).

Almost surely, 2^16851540 is an apocalyptic number.

16851540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16851540 is an abundant number, since it is smaller than the sum of its proper divisors (30332940).

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

16851540 is a wasteful number, since it uses less digits than its factorization.

16851540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280871 (or 280869 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 16851540 is about 4105.0627279008. The cubic root of 16851540 is about 256.3774745492.

It can be divided in two parts, 16851 and 540, that added together give a triangular number (17391 = T₁₈₆).

The spelling of 16851540 in words is "sixteen million, eight hundred fifty-one thousand, five hundred forty".