16428449 has 2 divisors, whose sum is σ = 16428450. Its totient is φ = 16428448.

The previous prime is 16428437. The next prime is 16428487. The reversal of 16428449 is 94482461.

It is an a-pointer prime, because the next prime (16428487) can be obtained adding 16428449 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11343424 + 5085025 = 3368^2 + 2255^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16428449 is a prime.

It is not a weakly prime, because it can be changed into another prime (16428499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8214224 + 8214225.

It is an arithmetic number, because the mean of its divisors is an integer number (8214225).

Almost surely, 2^16428449 is an apocalyptic number.

It is an amenable number.

16428449 is a deficient number, since it is larger than the sum of its proper divisors (1).

16428449 is an equidigital number, since it uses as much as digits as its factorization.

16428449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 38.

The square root of 16428449 is about 4053.2023142202. The cubic root of 16428449 is about 254.2136431788.

The spelling of 16428449 in words is "sixteen million, four hundred twenty-eight thousand, four hundred forty-nine".