838421849 has 4 divisors (see below), whose sum is σ = 839660964. Its totient is φ = 837182736.

The previous prime is 838421809. The next prime is 838421851. The reversal of 838421849 is 948124838.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 688800025 + 149621824 = 26245^2 + 12232^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-838421849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (838421809) 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, 618542 + ... + 619895.

It is an arithmetic number, because the mean of its divisors is an integer number (209915241).

Almost surely, 2^838421849 is an apocalyptic number.

It is an amenable number.

838421849 is a deficient number, since it is larger than the sum of its proper divisors (1239115).

838421849 is a wasteful number, since it uses less digits than its factorization.

838421849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1239114.

The product of its digits is 442368, while the sum is 47.

The square root of 838421849 is about 28955.5150014639. The cubic root of 838421849 is about 942.9475340851.

The spelling of 838421849 in words is "eight hundred thirty-eight million, four hundred twenty-one thousand, eight hundred forty-nine".