16985997 has 48 divisors (see below), whose sum is σ = 30150720. Its totient is φ = 9416736.

The previous prime is 16985993. The next prime is 16986017. The reversal of 16985997 is 79958961.

It is not a de Polignac number, because 16985997 - 2² = 16985993 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16985993) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 48778 + ... + 49124.

It is an arithmetic number, because the mean of its divisors is an integer number (628140).

Almost surely, 2^16985997 is an apocalyptic number.

It is an amenable number.

16985997 is a deficient number, since it is larger than the sum of its proper divisors (13164723).

16985997 is a wasteful number, since it uses less digits than its factorization.

16985997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407 (or 394 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 54.

The square root of 16985997 is about 4121.4071626084. The cubic root of 16985997 is about 257.0575403469.

The spelling of 16985997 in words is "sixteen million, nine hundred eighty-five thousand, nine hundred ninety-seven".