420100019 has 2 divisors, whose sum is σ = 420100020. Its totient is φ = 420100018.

The previous prime is 420099997. The next prime is 420100049. The reversal of 420100019 is 910001024.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420100019 is a prime.

It is a super-2 number, since 2×420100019² = 352968051927600722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (420100049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210050009 + 210050010.

It is an arithmetic number, because the mean of its divisors is an integer number (210050010).

Almost surely, 2^420100019 is an apocalyptic number.

420100019 is a deficient number, since it is larger than the sum of its proper divisors (1).

420100019 is an equidigital number, since it uses as much as digits as its factorization.

420100019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 420100019 is about 20496.3416003930. The cubic root of 420100019 is about 748.9466807915.

The spelling of 420100019 in words is "four hundred twenty million, one hundred thousand, nineteen".