16639954 has 4 divisors (see below), whose sum is σ = 24959934. Its totient is φ = 8319976.

The previous prime is 16639951. The next prime is 16639967. The reversal of 16639954 is 45993661.

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., 16589329 + 50625 = 4073^2 + 225^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16639954.

It is not an unprimeable number, because it can be changed into a prime (16639951) 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, 4159987 + ... + 4159990.

Almost surely, 2^16639954 is an apocalyptic number.

16639954 is a deficient number, since it is larger than the sum of its proper divisors (8319980).

16639954 is an equidigital number, since it uses as much as digits as its factorization.

16639954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8319979.

The product of its digits is 174960, while the sum is 43.

The square root of 16639954 is about 4079.2099725314. The cubic root of 16639954 is about 255.2999367016.

The spelling of 16639954 in words is "sixteen million, six hundred thirty-nine thousand, nine hundred fifty-four".