16224257 has 4 divisors (see below), whose sum is σ = 18542016. Its totient is φ = 13906500.

The previous prime is 16224227. The next prime is 16224277. The reversal of 16224257 is 75242261.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 16224257 - 2⁶ = 16224193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16224227) 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, 1158869 + ... + 1158882.

It is an arithmetic number, because the mean of its divisors is an integer number (4635504).

It is a Proth number, since it is equal to 3961 ⋅ 2¹² + 1 and 3961 < 2¹².

Almost surely, 2^16224257 is an apocalyptic number.

It is an amenable number.

16224257 is a deficient number, since it is larger than the sum of its proper divisors (2317759).

16224257 is an equidigital number, since it uses as much as digits as its factorization.

16224257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2317758.

The product of its digits is 6720, while the sum is 29.

The square root of 16224257 is about 4027.9345823883. The cubic root of 16224257 is about 253.1560276348.

The spelling of 16224257 in words is "sixteen million, two hundred twenty-four thousand, two hundred fifty-seven".