1420620209 has 2 divisors, whose sum is σ = 1420620210. Its totient is φ = 1420620208.

The previous prime is 1420620203. The next prime is 1420620233. The reversal of 1420620209 is 9020260241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1043483809 + 377136400 = 32303^2 + 19420^2 .

It is a cyclic number.

It is not a de Polignac number, because 1420620209 - 2⁸ = 1420619953 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1420620203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710310104 + 710310105.

It is an arithmetic number, because the mean of its divisors is an integer number (710310105).

Almost surely, 2^1420620209 is an apocalyptic number.

It is an amenable number.

1420620209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1420620209 is an equidigital number, since it uses as much as digits as its factorization.

1420620209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1420620209 is about 37691.1157834310. The cubic root of 1420620209 is about 1124.1544814648.

The spelling of 1420620209 in words is "one billion, four hundred twenty million, six hundred twenty thousand, two hundred nine".