16805977 has 4 divisors (see below), whose sum is σ = 16853940. Its totient is φ = 16758016.

The previous prime is 16805969. The next prime is 16805981. The reversal of 16805977 is 77950861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77950861 = 83 ⋅939167.

It can be written as a sum of positive squares in 2 ways, for example, as 7901721 + 8904256 = 2811^2 + 2984^2 .

It is a cyclic number.

It is not a de Polignac number, because 16805977 - 2³ = 16805969 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (16803977) 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, 23452 + ... + 24157.

It is an arithmetic number, because the mean of its divisors is an integer number (4213485).

Almost surely, 2^16805977 is an apocalyptic number.

It is an amenable number.

16805977 is a deficient number, since it is larger than the sum of its proper divisors (47963).

16805977 is an equidigital number, since it uses as much as digits as its factorization.

16805977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47962.

The product of its (nonzero) digits is 105840, while the sum is 43.

The square root of 16805977 is about 4099.5093608870. The cubic root of 16805977 is about 256.1462024981.

The spelling of 16805977 in words is "sixteen million, eight hundred five thousand, nine hundred seventy-seven".