683857391 has 4 divisors (see below), whose sum is σ = 781551312. Its totient is φ = 586163472.

The previous prime is 683857387. The next prime is 683857393. The reversal of 683857391 is 193758386.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193758386 = 2 ⋅96879193.

It is a cyclic number.

It is not a de Polignac number, because 683857391 - 2² = 683857387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (683857393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48846950 + ... + 48846963.

It is an arithmetic number, because the mean of its divisors is an integer number (195387828).

Almost surely, 2^683857391 is an apocalyptic number.

683857391 is a deficient number, since it is larger than the sum of its proper divisors (97693921).

683857391 is an equidigital number, since it uses as much as digits as its factorization.

683857391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97693920.

The product of its digits is 1088640, while the sum is 50.

The square root of 683857391 is about 26150.6671234215. The cubic root of 683857391 is about 881.0255738485.

The spelling of 683857391 in words is "six hundred eighty-three million, eight hundred fifty-seven thousand, three hundred ninety-one".