16909429 has 4 divisors (see below), whose sum is σ = 16935084. Its totient is φ = 16883776.

The previous prime is 16909391. The next prime is 16909447. The reversal of 16909429 is 92490961.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8940100 + 7969329 = 2990^2 + 2823^2 .

It is a cyclic number.

It is not a de Polignac number, because 16909429 - 2¹¹ = 16907381 is a prime.

It is a super-3 number, since 3×16909429³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16909391 and 16909400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16909469) 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, 11812 + ... + 13165.

It is an arithmetic number, because the mean of its divisors is an integer number (4233771).

Almost surely, 2^16909429 is an apocalyptic number.

It is an amenable number.

16909429 is a deficient number, since it is larger than the sum of its proper divisors (25655).

16909429 is an equidigital number, since it uses as much as digits as its factorization.

16909429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25654.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 16909429 is about 4112.1076104596. The cubic root of 16909429 is about 256.6707113172.

The spelling of 16909429 in words is "sixteen million, nine hundred nine thousand, four hundred twenty-nine".