16856442 has 12 divisors (see below), whose sum is σ = 36522330. Its totient is φ = 5618808.

The previous prime is 16856429. The next prime is 16856443. The reversal of 16856442 is 24465861.

16856442 is a `hidden beast` number, since 1 + 6 + 8 + 5 + 644 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10246401 + 6610041 = 3201^2 + 2571^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16856397 and 16856406.

It is not an unprimeable number, because it can be changed into a prime (16856443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 468217 + ... + 468252.

Almost surely, 2^16856442 is an apocalyptic number.

16856442 is an abundant number, since it is smaller than the sum of its proper divisors (19665888).

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

16856442 is a wasteful number, since it uses less digits than its factorization.

16856442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936477 (or 936474 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 16856442 is about 4105.6597520983. The cubic root of 16856442 is about 256.4023316352.

The spelling of 16856442 in words is "sixteen million, eight hundred fifty-six thousand, four hundred forty-two".