1386815869 has 2 divisors, whose sum is σ = 1386815870. Its totient is φ = 1386815868.

The previous prime is 1386815839. The next prime is 1386815897. The reversal of 1386815869 is 9685186831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1036002969 + 350812900 = 32187^2 + 18730^2 .

It is a cyclic number.

It is not a de Polignac number, because 1386815869 - 2⁷ = 1386815741 is a prime.

It is a super-2 number, since 2×1386815869² = 3846516509020450322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1386815839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693407934 + 693407935.

It is an arithmetic number, because the mean of its divisors is an integer number (693407935).

Almost surely, 2^1386815869 is an apocalyptic number.

It is an amenable number.

1386815869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1386815869 is an equidigital number, since it uses as much as digits as its factorization.

1386815869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2488320, while the sum is 55.

The square root of 1386815869 is about 37239.9767588542. The cubic root of 1386815869 is about 1115.1662079376.

It can be divided in two parts, 1386815 and 869, that added together give a square (1387684 = 1178²).

The spelling of 1386815869 in words is "one billion, three hundred eighty-six million, eight hundred fifteen thousand, eight hundred sixty-nine".