1382709857 has 4 divisors (see below), whose sum is σ = 1455484080. Its totient is φ = 1309935636.

The previous prime is 1382709851. The next prime is 1382709859. The reversal of 1382709857 is 7589072831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7589072831 = 31 ⋅244808801.

It is a cyclic number.

It is not a de Polignac number, because 1382709857 - 2⁶ = 1382709793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1382709851) 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, 36387083 + ... + 36387120.

It is an arithmetic number, because the mean of its divisors is an integer number (363871020).

Almost surely, 2^1382709857 is an apocalyptic number.

It is an amenable number.

1382709857 is a deficient number, since it is larger than the sum of its proper divisors (72774223).

1382709857 is an equidigital number, since it uses as much as digits as its factorization.

1382709857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72774222.

The product of its (nonzero) digits is 846720, while the sum is 50.

The square root of 1382709857 is about 37184.8068033169. The cubic root of 1382709857 is about 1114.0645446821.

The spelling of 1382709857 in words is "one billion, three hundred eighty-two million, seven hundred nine thousand, eight hundred fifty-seven".