16387705 has 4 divisors (see below), whose sum is σ = 19665252. Its totient is φ = 13110160.

The previous prime is 16387703. The next prime is 16387717. The reversal of 16387705 is 50778361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50778361 = 2503 ⋅20287.

It can be written as a sum of positive squares in 2 ways, for example, as 10949481 + 5438224 = 3309^2 + 2332^2 .

It is not a de Polignac number, because 16387705 - 2¹ = 16387703 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16387703) 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, 1638766 + ... + 1638775.

It is an arithmetic number, because the mean of its divisors is an integer number (4916313).

Almost surely, 2^16387705 is an apocalyptic number.

It is an amenable number.

16387705 is a deficient number, since it is larger than the sum of its proper divisors (3277547).

16387705 is an equidigital number, since it uses as much as digits as its factorization.

16387705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3277546.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 16387705 is about 4048.1730447203. The cubic root of 16387705 is about 254.0033117968.

The spelling of 16387705 in words is "sixteen million, three hundred eighty-seven thousand, seven hundred five".