16381693 has 4 divisors (see below), whose sum is σ = 17345340. Its totient is φ = 15418048.

The previous prime is 16381691. The next prime is 16381699. The reversal of 16381693 is 39618361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39618361 = 101 ⋅392261.

It can be written as a sum of positive squares in 2 ways, for example, as 14152644 + 2229049 = 3762^2 + 1493^2 .

It is not a de Polignac number, because 16381693 - 2¹ = 16381691 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 (16381691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 481798 + ... + 481831.

It is an arithmetic number, because the mean of its divisors is an integer number (4336335).

Almost surely, 2^16381693 is an apocalyptic number.

It is an amenable number.

16381693 is a deficient number, since it is larger than the sum of its proper divisors (963647).

16381693 is an equidigital number, since it uses as much as digits as its factorization.

16381693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963646.

The product of its digits is 23328, while the sum is 37.

The square root of 16381693 is about 4047.4304194143. The cubic root of 16381693 is about 253.9722467455.

The spelling of 16381693 in words is "sixteen million, three hundred eighty-one thousand, six hundred ninety-three".