1381837 has 2 divisors, whose sum is σ = 1381838. Its totient is φ = 1381836.

The previous prime is 1381819. The next prime is 1381859. The reversal of 1381837 is 7381831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 820836 + 561001 = 906^2 + 749^2 .

It is an emirp because it is prime and its reverse (7381831) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1381837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1381799 and 1381808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1381337) 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, 690918 + 690919.

It is an arithmetic number, because the mean of its divisors is an integer number (690919).

2^1381837 is an apocalyptic number.

It is an amenable number.

1381837 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381837 is an equidigital number, since it uses as much as digits as its factorization.

1381837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 31.

The square root of 1381837 is about 1175.5156315422. The cubic root of 1381837 is about 111.3830071841.

The spelling of 1381837 in words is "one million, three hundred eighty-one thousand, eight hundred thirty-seven".