16809938 has 4 divisors (see below), whose sum is σ = 25214910. Its totient is φ = 8404968.

The previous prime is 16809931. The next prime is 16809943. The reversal of 16809938 is 83990861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12837889 + 3972049 = 3583^2 + 1993^2 .

It is not an unprimeable number, because it can be changed into a prime (16809931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4202483 + ... + 4202486.

Almost surely, 2^16809938 is an apocalyptic number.

16809938 is a deficient number, since it is larger than the sum of its proper divisors (8404972).

16809938 is an equidigital number, since it uses as much as digits as its factorization.

16809938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8404971.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 16809938 is about 4099.9924390174. The cubic root of 16809938 is about 256.1663246131.

The spelling of 16809938 in words is "sixteen million, eight hundred nine thousand, nine hundred thirty-eight".