1383492857 has 4 divisors (see below), whose sum is σ = 1383855780. Its totient is φ = 1383129936.

The previous prime is 1383492833. The next prime is 1383492881. The reversal of 1383492857 is 7582943831.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1383492833) and next prime (1383492881).

It can be written as a sum of positive squares in 2 ways, for example, as 668946496 + 714546361 = 25864^2 + 26731^2 .

It is a cyclic number.

It is not a de Polignac number, because 1383492857 - 2¹⁰ = 1383491833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1383495857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175682 + ... + 183387.

It is an arithmetic number, because the mean of its divisors is an integer number (345963945).

Almost surely, 2^1383492857 is an apocalyptic number.

It is an amenable number.

1383492857 is a deficient number, since it is larger than the sum of its proper divisors (362923).

1383492857 is an equidigital number, since it uses as much as digits as its factorization.

1383492857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362922.

The product of its digits is 1451520, while the sum is 50.

The square root of 1383492857 is about 37195.3338068097. Note that the first 3 decimals coincide. The cubic root of 1383492857 is about 1114.2747955718.

The spelling of 1383492857 in words is "one billion, three hundred eighty-three million, four hundred ninety-two thousand, eight hundred fifty-seven".