1385775831 has 8 divisors (see below), whose sum is σ = 2015673984. Its totient is φ = 839864120.

The previous prime is 1385775821. The next prime is 1385775847.

1385775831 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1385775831 - 2²⁶ = 1318666967 is a prime.

It is a super-2 number, since 2×1385775831² = 3840749307567481122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1385775821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20996571 + ... + 20996636.

It is an arithmetic number, because the mean of its divisors is an integer number (251959248).

Almost surely, 2^1385775831 is an apocalyptic number.

1385775831 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1385775831 is a deficient number, since it is larger than the sum of its proper divisors (629898153).

1385775831 is a wasteful number, since it uses less digits than its factorization.

1385775831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41993221.

The product of its digits is 705600, while the sum is 48.

The square root of 1385775831 is about 37226.0101407605. The cubic root of 1385775831 is about 1114.8873664772.

The spelling of 1385775831 in words is "one billion, three hundred eighty-five million, seven hundred seventy-five thousand, eight hundred thirty-one".