16870909 has 6 divisors (see below), whose sum is σ = 18544190. Its totient is φ = 15337080.

The previous prime is 16870901. The next prime is 16870933. The reversal of 16870909 is 90907861.

It can be written as a sum of positive squares in only one way, i.e., 10745284 + 6125625 = 3278^2 + 2475^2 .

It is not a de Polignac number, because 16870909 - 2³ = 16870901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16870901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69594 + ... + 69835.

Almost surely, 2^16870909 is an apocalyptic number.

It is an amenable number.

16870909 is a deficient number, since it is larger than the sum of its proper divisors (1673281).

16870909 is a wasteful number, since it uses less digits than its factorization.

16870909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139451 (or 139440 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 16870909 is about 4107.4212104434. The cubic root of 16870909 is about 256.4756628845.

The spelling of 16870909 in words is "sixteen million, eight hundred seventy thousand, nine hundred nine".