19420217 has 2 divisors, whose sum is σ = 19420218. Its totient is φ = 19420216.

The previous prime is 19420201. The next prime is 19420241. The reversal of 19420217 is 71202491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13388281 + 6031936 = 3659^2 + 2456^2 .

It is a cyclic number.

It is not a de Polignac number, because 19420217 - 2⁴ = 19420201 is a prime.

It is not a weakly prime, because it can be changed into another prime (19420267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9710108 + 9710109.

It is an arithmetic number, because the mean of its divisors is an integer number (9710109).

Almost surely, 2^19420217 is an apocalyptic number.

It is an amenable number.

19420217 is a deficient number, since it is larger than the sum of its proper divisors (1).

19420217 is an equidigital number, since it uses as much as digits as its factorization.

19420217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 19420217 is about 4406.8375282055. The cubic root of 19420217 is about 268.7930443403.

The spelling of 19420217 in words is "nineteen million, four hundred twenty thousand, two hundred seventeen".