16422457 has 2 divisors, whose sum is σ = 16422458. Its totient is φ = 16422456.

The previous prime is 16422451. The next prime is 16422491. The reversal of 16422457 is 75422461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16168441 + 254016 = 4021^2 + 504^2 .

It is an emirp because it is prime and its reverse (75422461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16422457 - 2¹⁵ = 16389689 is a prime.

It is not a weakly prime, because it can be changed into another prime (16422451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8211228 + 8211229.

It is an arithmetic number, because the mean of its divisors is an integer number (8211229).

Almost surely, 2^16422457 is an apocalyptic number.

It is an amenable number.

16422457 is a deficient number, since it is larger than the sum of its proper divisors (1).

16422457 is an equidigital number, since it uses as much as digits as its factorization.

16422457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 31.

The square root of 16422457 is about 4052.4630781785. The cubic root of 16422457 is about 254.1827327060.

The spelling of 16422457 in words is "sixteen million, four hundred twenty-two thousand, four hundred fifty-seven".