1386934691 has 2 divisors, whose sum is σ = 1386934692. Its totient is φ = 1386934690.

The previous prime is 1386934669. The next prime is 1386934709. The reversal of 1386934691 is 1964396831.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1386934691 is a prime.

It is not a weakly prime, because it can be changed into another prime (1386934391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693467345 + 693467346.

It is an arithmetic number, because the mean of its divisors is an integer number (693467346).

Almost surely, 2^1386934691 is an apocalyptic number.

1386934691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1386934691 is an equidigital number, since it uses as much as digits as its factorization.

1386934691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 839808, while the sum is 50.

The square root of 1386934691 is about 37241.5720801365. The cubic root of 1386934691 is about 1115.1980560721.

The spelling of 1386934691 in words is "one billion, three hundred eighty-six million, nine hundred thirty-four thousand, six hundred ninety-one".