16909777 has 4 divisors (see below), whose sum is σ = 17366836. Its totient is φ = 16452720.

The previous prime is 16909771. The next prime is 16909799. The reversal of 16909777 is 77790961.

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 8667136 + 8242641 = 2944^2 + 2871^2 .

It is a cyclic number.

It is not a de Polignac number, because 16909777 - 2¹⁹ = 16385489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16909771) 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, 228474 + ... + 228547.

It is an arithmetic number, because the mean of its divisors is an integer number (4341709).

Almost surely, 2^16909777 is an apocalyptic number.

It is an amenable number.

16909777 is a deficient number, since it is larger than the sum of its proper divisors (457059).

16909777 is an equidigital number, since it uses as much as digits as its factorization.

16909777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457058.

The product of its (nonzero) digits is 166698, while the sum is 46.

The square root of 16909777 is about 4112.1499243097. The cubic root of 16909777 is about 256.6724720862.

The spelling of 16909777 in words is "sixteen million, nine hundred nine thousand, seven hundred seventy-seven".