16859749 has 2 divisors, whose sum is σ = 16859750. Its totient is φ = 16859748.

The previous prime is 16859747. The next prime is 16859771. The reversal of 16859749 is 94795861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16564900 + 294849 = 4070^2 + 543^2 .

It is a cyclic number.

It is not a de Polignac number, because 16859749 - 2¹ = 16859747 is a prime.

It is a super-2 number, since 2×16859749² = 568502272686002, which contains 22 as substring.

Together with 16859747, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16859743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8429874 + 8429875.

It is an arithmetic number, because the mean of its divisors is an integer number (8429875).

Almost surely, 2^16859749 is an apocalyptic number.

It is an amenable number.

16859749 is a deficient number, since it is larger than the sum of its proper divisors (1).

16859749 is an equidigital number, since it uses as much as digits as its factorization.

16859749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 49.

The square root of 16859749 is about 4106.0624690815. The cubic root of 16859749 is about 256.4190980653.

The spelling of 16859749 in words is "sixteen million, eight hundred fifty-nine thousand, seven hundred forty-nine".