420647219 has 2 divisors, whose sum is σ = 420647220. Its totient is φ = 420647218.

The previous prime is 420647189. The next prime is 420647231. The reversal of 420647219 is 912746024.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420647219 is a prime.

It is a super-2 number, since 2×420647219² = 353888165704867922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (420047219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210323609 + 210323610.

It is an arithmetic number, because the mean of its divisors is an integer number (210323610).

Almost surely, 2^420647219 is an apocalyptic number.

420647219 is a deficient number, since it is larger than the sum of its proper divisors (1).

420647219 is an equidigital number, since it uses as much as digits as its factorization.

420647219 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 420647219 is about 20509.6859800437. The cubic root of 420647219 is about 749.2717191122.

The spelling of 420647219 in words is "four hundred twenty million, six hundred forty-seven thousand, two hundred nineteen".