1386650669 has 2 divisors, whose sum is σ = 1386650670. Its totient is φ = 1386650668.

The previous prime is 1386650653. The next prime is 1386650701. The reversal of 1386650669 is 9660566831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1356817225 + 29833444 = 36835^2 + 5462^2 .

It is a cyclic number.

It is not a de Polignac number, because 1386650669 - 2⁴ = 1386650653 is a prime.

It is a super-2 number, since 2×1386650669² = 3845600155676295122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1386650869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693325334 + 693325335.

It is an arithmetic number, because the mean of its divisors is an integer number (693325335).

Almost surely, 2^1386650669 is an apocalyptic number.

It is an amenable number.

1386650669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1386650669 is an equidigital number, since it uses as much as digits as its factorization.

1386650669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1399680, while the sum is 50.

The square root of 1386650669 is about 37237.7586462988. The cubic root of 1386650669 is about 1115.1219259779.

The spelling of 1386650669 in words is "one billion, three hundred eighty-six million, six hundred fifty thousand, six hundred sixty-nine".