16870729 has 4 divisors (see below), whose sum is σ = 16892100. Its totient is φ = 16849360.

The previous prime is 16870717. The next prime is 16870741. The reversal of 16870729 is 92707861.

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

It is an interprime number because it is at equal distance from previous prime (16870717) and next prime (16870741).

It can be written as a sum of positive squares in 2 ways, for example, as 11799225 + 5071504 = 3435^2 + 2252^2 .

It is a cyclic number.

It is not a de Polignac number, because 16870729 - 2¹³ = 16862537 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16870691 and 16870700.

It is not an unprimeable number, because it can be changed into a prime (16870759) 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, 9454 + ... + 11095.

It is an arithmetic number, because the mean of its divisors is an integer number (4223025).

Almost surely, 2^16870729 is an apocalyptic number.

It is an amenable number.

16870729 is a deficient number, since it is larger than the sum of its proper divisors (21371).

16870729 is an equidigital number, since it uses as much as digits as its factorization.

16870729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21370.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 16870729 is about 4107.3992988264. The cubic root of 16870729 is about 256.4747507467.

The spelling of 16870729 in words is "sixteen million, eight hundred seventy thousand, seven hundred twenty-nine".