16723681 has 16 divisors (see below), whose sum is σ = 18643968. Its totient is φ = 14904000.

The previous prime is 16723657. The next prime is 16723687. The reversal of 16723681 is 18632761.

It is a cyclic number.

It is not a de Polignac number, because 16723681 - 2¹¹ = 16721633 is a prime.

It is a super-2 number, since 2×16723681² = 559363012379522, which contains 22 as substring.

It is a Duffinian number.

Its product of digits (12096) is a multiple of the sum of its prime divisors (432).

It is not an unprimeable number, because it can be changed into a prime (16723687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61576 + ... + 61846.

It is an arithmetic number, because the mean of its divisors is an integer number (1165248).

Almost surely, 2^16723681 is an apocalyptic number.

It is an amenable number.

16723681 is a deficient number, since it is larger than the sum of its proper divisors (1920287).

16723681 is a wasteful number, since it uses less digits than its factorization.

16723681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432.

The product of its digits is 12096, while the sum is 34.

The square root of 16723681 is about 4089.4597442694. The cubic root of 16723681 is about 255.7274167715.

The spelling of 16723681 in words is "sixteen million, seven hundred twenty-three thousand, six hundred eighty-one".