1420008991 has 4 divisors (see below), whose sum is σ = 1444077000. Its totient is φ = 1395940984.

The previous prime is 1420008959. The next prime is 1420009007. The reversal of 1420008991 is 1998000241.

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

It is a cyclic number.

It is not a de Polignac number, because 1420008991 - 2⁵ = 1420008959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1420008901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12033916 + ... + 12034033.

It is an arithmetic number, because the mean of its divisors is an integer number (361019250).

Almost surely, 2^1420008991 is an apocalyptic number.

1420008991 is a deficient number, since it is larger than the sum of its proper divisors (24068009).

1420008991 is an equidigital number, since it uses as much as digits as its factorization.

1420008991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24068008.

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

The square root of 1420008991 is about 37683.0066608279. The cubic root of 1420008991 is about 1123.9932368632.

The spelling of 1420008991 in words is "one billion, four hundred twenty million, eight thousand, nine hundred ninety-one".