16420057 has 2 divisors, whose sum is σ = 16420058. Its totient is φ = 16420056.

The previous prime is 16420051. The next prime is 16420073. The reversal of 16420057 is 75002461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9339136 + 7080921 = 3056^2 + 2661^2 .

It is an emirp because it is prime and its reverse (75002461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16420057 - 2⁷ = 16419929 is a prime.

It is a super-3 number, since 3×16420057³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (16420051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8210028 + 8210029.

It is an arithmetic number, because the mean of its divisors is an integer number (8210029).

Almost surely, 2^16420057 is an apocalyptic number.

It is an amenable number.

16420057 is a deficient number, since it is larger than the sum of its proper divisors (1).

16420057 is an equidigital number, since it uses as much as digits as its factorization.

16420057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 16420057 is about 4052.1669511510. The cubic root of 16420057 is about 254.1703499003.

The spelling of 16420057 in words is "sixteen million, four hundred twenty thousand, fifty-seven".