838394646457 has 4 divisors (see below), whose sum is σ = 839698526800. Its totient is φ = 837090766116.

The previous prime is 838394646317. The next prime is 838394646491. The reversal of 838394646457 is 754646493838.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-838394646457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 838394646392 and 838394646401.

It is not an unprimeable number, because it can be changed into a prime (838394641457) 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, 651939207 + ... + 651940492.

It is an arithmetic number, because the mean of its divisors is an integer number (209924631700).

Almost surely, 2^838394646457 is an apocalyptic number.

It is an amenable number.

838394646457 is a deficient number, since it is larger than the sum of its proper divisors (1303880343).

838394646457 is a wasteful number, since it uses less digits than its factorization.

838394646457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303880342.

The product of its digits is 418037760, while the sum is 67.

The spelling of 838394646457 in words is "eight hundred thirty-eight billion, three hundred ninety-four million, six hundred forty-six thousand, four hundred fifty-seven".