16388749 has 4 divisors (see below), whose sum is σ = 17649436. Its totient is φ = 15128064.

The previous prime is 16388747. The next prime is 16388753. The reversal of 16388749 is 94788361.

It is a happy number.

16388749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94788361 = 233 ⋅406817.

It can be written as a sum of positive squares in 2 ways, for example, as 9259849 + 7128900 = 3043^2 + 2670^2 .

It is a cyclic number.

It is not a de Polignac number, because 16388749 - 2¹ = 16388747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16388699 and 16388708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16388747) 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, 630324 + ... + 630349.

It is an arithmetic number, because the mean of its divisors is an integer number (4412359).

Almost surely, 2^16388749 is an apocalyptic number.

It is an amenable number.

16388749 is a deficient number, since it is larger than the sum of its proper divisors (1260687).

16388749 is a wasteful number, since it uses less digits than its factorization.

16388749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260686.

The product of its digits is 290304, while the sum is 46.

The square root of 16388749 is about 4048.3019897236. The cubic root of 16388749 is about 254.0087055524.

The spelling of 16388749 in words is "sixteen million, three hundred eighty-eight thousand, seven hundred forty-nine".