16723649 has 4 divisors (see below), whose sum is σ = 16803120. Its totient is φ = 16644180.

The previous prime is 16723639. The next prime is 16723657. The reversal of 16723649 is 94632761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16723649 - 2¹² = 16719553 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16723639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39419 + ... + 39840.

It is an arithmetic number, because the mean of its divisors is an integer number (4200780).

Almost surely, 2^16723649 is an apocalyptic number.

It is an amenable number.

16723649 is a deficient number, since it is larger than the sum of its proper divisors (79471).

16723649 is an equidigital number, since it uses as much as digits as its factorization.

16723649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79470.

The product of its digits is 54432, while the sum is 38.

The square root of 16723649 is about 4089.4558317703. The cubic root of 16723649 is about 255.7272536638.

The spelling of 16723649 in words is "sixteen million, seven hundred twenty-three thousand, six hundred forty-nine".