15946866 has 48 divisors (see below), whose sum is σ = 38840256. Its totient is φ = 4691808.

The previous prime is 15946859. The next prime is 15946877. The reversal of 15946866 is 66864951.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3901 + ... + 6863.

It is an arithmetic number, because the mean of its divisors is an integer number (809172).

Almost surely, 2^15946866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15946866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19420128).

15946866 is an abundant number, since it is smaller than the sum of its proper divisors (22893390).

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

15946866 is a wasteful number, since it uses less digits than its factorization.

15946866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3007 (or 3004 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 15946866 is about 3993.3527267197. The cubic root of 15946866 is about 251.7049646164.

The spelling of 15946866 in words is "fifteen million, nine hundred forty-six thousand, eight hundred sixty-six".