16422401 has 2 divisors, whose sum is σ = 16422402. Its totient is φ = 16422400.

The previous prime is 16422397. The next prime is 16422409. The reversal of 16422401 is 10422461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8271376 + 8151025 = 2876^2 + 2855^2 .

It is a cyclic number.

It is not a de Polignac number, because 16422401 - 2² = 16422397 is a prime.

It is not a weakly prime, because it can be changed into another prime (16422409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8211200 + 8211201.

It is an arithmetic number, because the mean of its divisors is an integer number (8211201).

Almost surely, 2^16422401 is an apocalyptic number.

It is an amenable number.

16422401 is a deficient number, since it is larger than the sum of its proper divisors (1).

16422401 is an equidigital number, since it uses as much as digits as its factorization.

16422401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 16422401 is about 4052.4561687944. The cubic root of 16422401 is about 254.1824437876.

Adding to 16422401 its reverse (10422461), we get a palindrome (26844862).

The spelling of 16422401 in words is "sixteen million, four hundred twenty-two thousand, four hundred one".