16402249 has 2 divisors, whose sum is σ = 16402250. Its totient is φ = 16402248.

The previous prime is 16402247. The next prime is 16402259. The reversal of 16402249 is 94220461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9193024 + 7209225 = 3032^2 + 2685^2 .

It is an emirp because it is prime and its reverse (94220461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16402249 - 2¹ = 16402247 is a prime.

Together with 16402247, it forms a pair of twin primes.

It is equal to p_1055278 and since 16402249 and 1055278 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (16402247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8201124 + 8201125.

It is an arithmetic number, because the mean of its divisors is an integer number (8201125).

Almost surely, 2^16402249 is an apocalyptic number.

It is an amenable number.

16402249 is a deficient number, since it is larger than the sum of its proper divisors (1).

16402249 is an equidigital number, since it uses as much as digits as its factorization.

16402249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 16402249 is about 4049.9690122271. The cubic root of 16402249 is about 254.0784317691.

The spelling of 16402249 in words is "sixteen million, four hundred two thousand, two hundred forty-nine".