1381859 has 2 divisors, whose sum is σ = 1381860. Its totient is φ = 1381858.

The previous prime is 1381837. The next prime is 1381871. The reversal of 1381859 is 9581831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1381859 - 2¹⁶ = 1316323 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1381819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690929 + 690930.

It is an arithmetic number, because the mean of its divisors is an integer number (690930).

2^1381859 is an apocalyptic number.

1381859 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381859 is an equidigital number, since it uses as much as digits as its factorization.

1381859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 35.

The square root of 1381859 is about 1175.5249891006. The cubic root of 1381859 is about 111.3835982845.

The spelling of 1381859 in words is "one million, three hundred eighty-one thousand, eight hundred fifty-nine".