16749649 has 16 divisors (see below), whose sum is σ = 19611648. Its totient is φ = 14010192.

The previous prime is 16749647. The next prime is 16749679. The reversal of 16749649 is 94694761.

It is not a de Polignac number, because 16749649 - 2¹ = 16749647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16749599 and 16749608.

It is not an unprimeable number, because it can be changed into a prime (16749647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73674 + ... + 73900.

It is an arithmetic number, because the mean of its divisors is an integer number (1225728).

Almost surely, 2^16749649 is an apocalyptic number.

It is an amenable number.

16749649 is a deficient number, since it is larger than the sum of its proper divisors (2861999).

16749649 is a wasteful number, since it uses less digits than its factorization.

16749649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444.

The product of its digits is 326592, while the sum is 46.

The square root of 16749649 is about 4092.6335042366. The cubic root of 16749649 is about 255.8597101215.

The spelling of 16749649 in words is "sixteen million, seven hundred forty-nine thousand, six hundred forty-nine".