1387819 has 2 divisors, whose sum is σ = 1387820. Its totient is φ = 1387818.

The previous prime is 1387807. The next prime is 1387823. The reversal of 1387819 is 9187831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1387819 - 2⁷ = 1387691 is a prime.

It is a super-2 number, since 2×1387819² = 3852083153522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1387849) 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, 693909 + 693910.

It is an arithmetic number, because the mean of its divisors is an integer number (693910).

2^1387819 is an apocalyptic number.

1387819 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387819 is an equidigital number, since it uses as much as digits as its factorization.

1387819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 37.

The square root of 1387819 is about 1178.0572991158. The cubic root of 1387819 is about 111.5435022326.

The spelling of 1387819 in words is "one million, three hundred eighty-seven thousand, eight hundred nineteen".