16749391 has 8 divisors (see below), whose sum is σ = 16966784. Its totient is φ = 16533720.

The previous prime is 16749389. The next prime is 16749401. The reversal of 16749391 is 19394761.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 10-Lehmer number, since φ(16749391) divides (16749391-1)¹⁰.

It is a cyclic number.

It is not a de Polignac number, because 16749391 - 2¹ = 16749389 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 (16749311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34150 + ... + 34636.

It is an arithmetic number, because the mean of its divisors is an integer number (2120848).

Almost surely, 2^16749391 is an apocalyptic number.

16749391 is a deficient number, since it is larger than the sum of its proper divisors (217393).

16749391 is a wasteful number, since it uses less digits than its factorization.

16749391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861.

The product of its digits is 40824, while the sum is 40.

The square root of 16749391 is about 4092.6019840683. The cubic root of 16749391 is about 255.8583964194.

The spelling of 16749391 in words is "sixteen million, seven hundred forty-nine thousand, three hundred ninety-one".