1421820709 has 2 divisors, whose sum is σ = 1421820710. Its totient is φ = 1421820708.

The previous prime is 1421820679. The next prime is 1421820713. The reversal of 1421820709 is 9070281241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1421063809 + 756900 = 37697^2 + 870^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421820709 - 2⁷ = 1421820581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1421820769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710910354 + 710910355.

It is an arithmetic number, because the mean of its divisors is an integer number (710910355).

Almost surely, 2^1421820709 is an apocalyptic number.

It is an amenable number.

1421820709 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421820709 is an equidigital number, since it uses as much as digits as its factorization.

1421820709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 1421820709 is about 37707.0379239738. The cubic root of 1421820709 is about 1124.4710491813.

The spelling of 1421820709 in words is "one billion, four hundred twenty-one million, eight hundred twenty thousand, seven hundred nine".