16991982 has 24 divisors (see below), whose sum is σ = 42075696. Its totient is φ = 4854816.

The previous prime is 16991951. The next prime is 16992007. The reversal of 16991982 is 28919961.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67303 + ... + 67554.

It is an arithmetic number, because the mean of its divisors is an integer number (1753154).

Almost surely, 2^16991982 is an apocalyptic number.

16991982 is an abundant number, since it is smaller than the sum of its proper divisors (25083714).

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

16991982 is a wasteful number, since it uses less digits than its factorization.

16991982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134872 (or 134869 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 16991982 is about 4122.1331856213. The cubic root of 16991982 is about 257.0877281288.

The spelling of 16991982 in words is "sixteen million, nine hundred ninety-one thousand, nine hundred eighty-two".