1421890009 has 4 divisors (see below), whose sum is σ = 1421981620. Its totient is φ = 1421798400.

The previous prime is 1421890003. The next prime is 1421890049. The reversal of 1421890009 is 9000981241.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 46963609 + 1374926400 = 6853^2 + 37080^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421890009 - 2²⁹ = 885019097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1421890003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16104 + ... + 55705.

It is an arithmetic number, because the mean of its divisors is an integer number (355495405).

Almost surely, 2^1421890009 is an apocalyptic number.

It is an amenable number.

1421890009 is a deficient number, since it is larger than the sum of its proper divisors (91611).

1421890009 is an equidigital number, since it uses as much as digits as its factorization.

1421890009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91610.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 1421890009 is about 37707.9568393728. The cubic root of 1421890009 is about 1124.4893179117.

The spelling of 1421890009 in words is "one billion, four hundred twenty-one million, eight hundred ninety thousand, nine".