1320677387 has 2 divisors, whose sum is σ = 1320677388. Its totient is φ = 1320677386.

The previous prime is 1320677357. The next prime is 1320677431. The reversal of 1320677387 is 7837760231.

It is an a-pointer prime, because the next prime (1320677431) can be obtained adding 1320677387 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1320677387 - 2²² = 1316483083 is a prime.

It is not a weakly prime, because it can be changed into another prime (1320677357) 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 as a sum of consecutive naturals, namely, 660338693 + 660338694.

It is an arithmetic number, because the mean of its divisors is an integer number (660338694).

Almost surely, 2^1320677387 is an apocalyptic number.

1320677387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320677387 is an equidigital number, since it uses as much as digits as its factorization.

1320677387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 296352, while the sum is 44.

The square root of 1320677387 is about 36341.1252852743. The cubic root of 1320677387 is about 1097.1489216634.

The spelling of 1320677387 in words is "one billion, three hundred twenty million, six hundred seventy-seven thousand, three hundred eighty-seven".