16971898 has 4 divisors (see below), whose sum is σ = 25457850. Its totient is φ = 8485948.

The previous prime is 16971893. The next prime is 16971919. The reversal of 16971898 is 89817961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89817961 = 5167 ⋅17383.

It can be written as a sum of positive squares in only one way, i.e., 16056049 + 915849 = 4007^2 + 957^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (16971893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4242973 + ... + 4242976.

Almost surely, 2^16971898 is an apocalyptic number.

16971898 is a deficient number, since it is larger than the sum of its proper divisors (8485952).

16971898 is an equidigital number, since it uses as much as digits as its factorization.

16971898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8485951.

The product of its digits is 217728, while the sum is 49.

The square root of 16971898 is about 4119.6963480334. The cubic root of 16971898 is about 256.9863982668.

The spelling of 16971898 in words is "sixteen million, nine hundred seventy-one thousand, eight hundred ninety-eight".