16987971 has 32 divisors (see below), whose sum is σ = 30417408. Its totient is φ = 8144640.

The previous prime is 16987963. The next prime is 16987973. The reversal of 16987971 is 17978961.

It is a happy number.

It is not a de Polignac number, because 16987971 - 2³ = 16987963 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16987971.

It is not an unprimeable number, because it can be changed into a prime (16987973) 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 31 ways as a sum of consecutive naturals, for example, 175 + ... + 5831.

It is an arithmetic number, because the mean of its divisors is an integer number (950544).

Almost surely, 2^16987971 is an apocalyptic number.

16987971 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16987971 is a deficient number, since it is larger than the sum of its proper divisors (13429437).

16987971 is a wasteful number, since it uses less digits than its factorization.

16987971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5691.

The product of its digits is 190512, while the sum is 48.

The square root of 16987971 is about 4121.6466369644. The cubic root of 16987971 is about 257.0674978024.

It can be divided in two parts, 1698 and 7971, that added together give a palindrome (9669).

The spelling of 16987971 in words is "sixteen million, nine hundred eighty-seven thousand, nine hundred seventy-one".