16228749 has 4 divisors (see below), whose sum is σ = 21638336. Its totient is φ = 10819164.

The previous prime is 16228747. The next prime is 16228753. The reversal of 16228749 is 94782261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 16228749 - 2¹ = 16228747 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 (16228747) 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, 2704789 + ... + 2704794.

It is an arithmetic number, because the mean of its divisors is an integer number (5409584).

Almost surely, 2^16228749 is an apocalyptic number.

It is an amenable number.

16228749 is a deficient number, since it is larger than the sum of its proper divisors (5409587).

16228749 is an equidigital number, since it uses as much as digits as its factorization.

16228749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5409586.

The product of its digits is 48384, while the sum is 39.

The square root of 16228749 is about 4028.4921496759. The cubic root of 16228749 is about 253.1793891965.

The spelling of 16228749 in words is "sixteen million, two hundred twenty-eight thousand, seven hundred forty-nine".