1375987 has 2 divisors, whose sum is σ = 1375988. Its totient is φ = 1375986.

The previous prime is 1375981. The next prime is 1376003. The reversal of 1375987 is 7895731.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1375987 - 2¹⁵ = 1343219 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1375981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 687993 + 687994.

It is an arithmetic number, because the mean of its divisors is an integer number (687994).

2^1375987 is an apocalyptic number.

1375987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1375987 is an equidigital number, since it uses as much as digits as its factorization.

1375987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 40.

The square root of 1375987 is about 1173.0247226721. The cubic root of 1375987 is about 111.2256050538.

The spelling of 1375987 in words is "one million, three hundred seventy-five thousand, nine hundred eighty-seven".