838378975949 has 4 divisors (see below), whose sum is σ = 845798259036. Its totient is φ = 830959692864.

The previous prime is 838378975939. The next prime is 838378976003. The reversal of 838378975949 is 949579873838.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 949579873838 = 2 ⋅474789936919.

It can be written as a sum of positive squares in 2 ways, for example, as 179835364900 + 658543611049 = 424070^2 + 811507^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-838378975949 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 (838378975939) 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, 3709641374 + ... + 3709641599.

It is an arithmetic number, because the mean of its divisors is an integer number (211449564759).

Almost surely, 2^838378975949 is an apocalyptic number.

It is an amenable number.

838378975949 is a deficient number, since it is larger than the sum of its proper divisors (7419283087).

838378975949 is a wasteful number, since it uses less digits than its factorization.

838378975949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7419283086.

The product of its digits is 3292047360, while the sum is 80.

The spelling of 838378975949 in words is "eight hundred thirty-eight billion, three hundred seventy-eight million, nine hundred seventy-five thousand, nine hundred forty-nine".