1286945385 has 16 divisors (see below), whose sum is σ = 2246304960. Its totient is φ = 623973440.

The previous prime is 1286945371. The next prime is 1286945419. The reversal of 1286945385 is 5835496821.

It is not a de Polignac number, because 1286945385 - 2⁵ = 1286945353 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3899670 + ... + 3899999.

It is an arithmetic number, because the mean of its divisors is an integer number (140394060).

Almost surely, 2^1286945385 is an apocalyptic number.

1286945385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1286945385 is a deficient number, since it is larger than the sum of its proper divisors (959359575).

1286945385 is a wasteful number, since it uses less digits than its factorization.

1286945385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7799688.

The product of its digits is 2073600, while the sum is 51.

The square root of 1286945385 is about 35874.0210319390. The cubic root of 1286945385 is about 1087.7273257106.

The spelling of 1286945385 in words is "one billion, two hundred eighty-six million, nine hundred forty-five thousand, three hundred eighty-five".