1420091 has 2 divisors, whose sum is σ = 1420092. Its totient is φ = 1420090.

The previous prime is 1420073. The next prime is 1420093. The reversal of 1420091 is 1900241.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1420091 is a prime.

It is a Sophie Germain prime.

Together with 1420093, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1420093) 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 as a sum of consecutive naturals, namely, 710045 + 710046.

It is an arithmetic number, because the mean of its divisors is an integer number (710046).

2^1420091 is an apocalyptic number.

1420091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1420091 is an equidigital number, since it uses as much as digits as its factorization.

1420091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1420091 is about 1191.6757109214. The cubic root of 1420091 is about 112.4014874235.

The spelling of 1420091 in words is "one million, four hundred twenty thousand, ninety-one".