16639970 has 8 divisors (see below), whose sum is σ = 29951964. Its totient is φ = 6655984.

The previous prime is 16639969. The next prime is 16639993. The reversal of 16639970 is 7993661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15673681 + 966289 = 3959^2 + 983^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 831989 + ... + 832008.

Almost surely, 2^16639970 is an apocalyptic number.

16639970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16639970 is a deficient number, since it is larger than the sum of its proper divisors (13311994).

16639970 is a wasteful number, since it uses less digits than its factorization.

16639970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1664004.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 16639970 is about 4079.2119336950. The cubic root of 16639970 is about 255.3000185287.

The spelling of 16639970 in words is "sixteen million, six hundred thirty-nine thousand, nine hundred seventy".