1387109 has 2 divisors, whose sum is σ = 1387110. Its totient is φ = 1387108.

The previous prime is 1387069. The next prime is 1387117. The reversal of 1387109 is 9017831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 770884 + 616225 = 878^2 + 785^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1387109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1387129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693554 + 693555.

It is an arithmetic number, because the mean of its divisors is an integer number (693555).

2^1387109 is an apocalyptic number.

It is an amenable number.

1387109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387109 is an equidigital number, since it uses as much as digits as its factorization.

1387109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 1387109 is about 1177.7559169879. The cubic root of 1387109 is about 111.5244773224.

The spelling of 1387109 in words is "one million, three hundred eighty-seven thousand, one hundred nine".