16556946 has 32 divisors (see below), whose sum is σ = 40072320. Its totient is φ = 4452096.

The previous prime is 16556933. The next prime is 16556957. The reversal of 16556946 is 64965561.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16556898 and 16556907.

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 15 ways as a sum of consecutive naturals, for example, 10881 + ... + 12308.

It is an arithmetic number, because the mean of its divisors is an integer number (1252260).

Almost surely, 2^16556946 is an apocalyptic number.

16556946 is an abundant number, since it is smaller than the sum of its proper divisors (23515374).

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

16556946 is a wasteful number, since it uses less digits than its factorization.

16556946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23218.

The product of its digits is 194400, while the sum is 42.

The square root of 16556946 is about 4069.0227327947. The cubic root of 16556946 is about 254.8747096925.

The spelling of 16556946 in words is "sixteen million, five hundred fifty-six thousand, nine hundred forty-six".