1385786891 has 2 divisors, whose sum is σ = 1385786892. Its totient is φ = 1385786890.

The previous prime is 1385786887. The next prime is 1385786933. The reversal of 1385786891 is 1986875831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1385786891 - 2² = 1385786887 is a prime.

It is not a weakly prime, because it can be changed into another prime (1385786821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 692893445 + 692893446.

It is an arithmetic number, because the mean of its divisors is an integer number (692893446).

Almost surely, 2^1385786891 is an apocalyptic number.

1385786891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1385786891 is an equidigital number, since it uses as much as digits as its factorization.

1385786891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 56.

The square root of 1385786891 is about 37226.1586925108. The cubic root of 1385786891 is about 1114.8903324743.

The spelling of 1385786891 in words is "one billion, three hundred eighty-five million, seven hundred eighty-six thousand, eight hundred ninety-one".