1421989505 has 4 divisors (see below), whose sum is σ = 1706387412. Its totient is φ = 1137591600.

The previous prime is 1421989501. The next prime is 1421989529. The reversal of 1421989505 is 5059891241.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 950057329 + 471932176 = 30823^2 + 21724^2 .

It is not a de Polignac number, because 1421989505 - 2² = 1421989501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1421989501) 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, 142198946 + ... + 142198955.

It is an arithmetic number, because the mean of its divisors is an integer number (426596853).

Almost surely, 2^1421989505 is an apocalyptic number.

It is an amenable number.

1421989505 is a deficient number, since it is larger than the sum of its proper divisors (284397907).

1421989505 is an equidigital number, since it uses as much as digits as its factorization.

1421989505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284397906.

The product of its (nonzero) digits is 129600, while the sum is 44.

The square root of 1421989505 is about 37709.2761134446. The cubic root of 1421989505 is about 1124.5155458147.

The spelling of 1421989505 in words is "one billion, four hundred twenty-one million, nine hundred eighty-nine thousand, five hundred five".