1385171685 has 48 divisors (see below), whose sum is σ = 2547889344. Its totient is φ = 721550592.

The previous prime is 1385171677. The next prime is 1385171693. The reversal of 1385171685 is 5861715831.

It is an interprime number because it is at equal distance from previous prime (1385171677) and next prime (1385171693).

It is not a de Polignac number, because 1385171685 - 2³ = 1385171677 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1385171685.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 38989 + ... + 65501.

It is an arithmetic number, because the mean of its divisors is an integer number (53081028).

Almost surely, 2^1385171685 is an apocalyptic number.

1385171685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1385171685 is a deficient number, since it is larger than the sum of its proper divisors (1162717659).

1385171685 is an equidigital number, since it uses as much as digits as its factorization.

1385171685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26576 (or 26564 counting only the distinct ones).

The product of its digits is 201600, while the sum is 45.

The square root of 1385171685 is about 37217.8946879052. The cubic root of 1385171685 is about 1114.7253266453.

The spelling of 1385171685 in words is "one billion, three hundred eighty-five million, one hundred seventy-one thousand, six hundred eighty-five".