1420835891 has 2 divisors, whose sum is σ = 1420835892. Its totient is φ = 1420835890.

The previous prime is 1420835881. The next prime is 1420835909. The reversal of 1420835891 is 1985380241.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1420835891 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1420835881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710417945 + 710417946.

It is an arithmetic number, because the mean of its divisors is an integer number (710417946).

Almost surely, 2^1420835891 is an apocalyptic number.

1420835891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1420835891 is an equidigital number, since it uses as much as digits as its factorization.

1420835891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 1420835891 is about 37693.9768530730. The cubic root of 1420835891 is about 1124.2113692044.

The spelling of 1420835891 in words is "one billion, four hundred twenty million, eight hundred thirty-five thousand, eight hundred ninety-one".