1381819 has 2 divisors, whose sum is σ = 1381820. Its totient is φ = 1381818.

The previous prime is 1381769. The next prime is 1381837. The reversal of 1381819 is 9181831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1381819 - 2⁹ = 1381307 is a prime.

It is a super-2 number, since 2×1381819² = 3818847497522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1381859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690909 + 690910.

It is an arithmetic number, because the mean of its divisors is an integer number (690910).

2^1381819 is an apocalyptic number.

1381819 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381819 is an equidigital number, since it uses as much as digits as its factorization.

1381819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 31.

The square root of 1381819 is about 1175.5079753026. The cubic root of 1381819 is about 111.3825235518.

The spelling of 1381819 in words is "one million, three hundred eighty-one thousand, eight hundred nineteen".