1320887 has 2 divisors, whose sum is σ = 1320888. Its totient is φ = 1320886.

The previous prime is 1320881. The next prime is 1320889. The reversal of 1320887 is 7880231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1320887 - 2⁴ = 1320871 is a prime.

Together with 1320889, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320881) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660443 + 660444.

It is an arithmetic number, because the mean of its divisors is an integer number (660444).

2^1320887 is an apocalyptic number.

1320887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320887 is an equidigital number, since it uses as much as digits as its factorization.

1320887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 1320887 is about 1149.2984816835. The cubic root of 1320887 is about 109.7206963724.

The spelling of 1320887 in words is "one million, three hundred twenty thousand, eight hundred eighty-seven".