16691902 has 4 divisors (see below), whose sum is σ = 25037856. Its totient is φ = 8345950.

The previous prime is 16691891. The next prime is 16691903. The reversal of 16691902 is 20919661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20919661 = 7 ⋅2988523.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16691903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4172974 + ... + 4172977.

It is an arithmetic number, because the mean of its divisors is an integer number (6259464).

Almost surely, 2^16691902 is an apocalyptic number.

16691902 is a deficient number, since it is larger than the sum of its proper divisors (8345954).

16691902 is an equidigital number, since it uses as much as digits as its factorization.

16691902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8345953.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 16691902 is about 4085.5724201145. The cubic root of 16691902 is about 255.5653329452.

The spelling of 16691902 in words is "sixteen million, six hundred ninety-one thousand, nine hundred two".