838421847 has 10 divisors (see below), whose sum is σ = 1252457448. Its totient is φ = 558947844.

The previous prime is 838421809. The next prime is 838421851. The reversal of 838421847 is 748124838.

It is not a de Polignac number, because 838421847 - 2¹⁹ = 837897559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (838421807) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5175363 + ... + 5175524.

Almost surely, 2^838421847 is an apocalyptic number.

838421847 is a deficient number, since it is larger than the sum of its proper divisors (414035601).

838421847 is a wasteful number, since it uses less digits than its factorization.

838421847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10350899 (or 10350890 counting only the distinct ones).

The product of its digits is 344064, while the sum is 45.

The square root of 838421847 is about 28955.5149669281. The cubic root of 838421847 is about 942.9475333353.

The spelling of 838421847 in words is "eight hundred thirty-eight million, four hundred twenty-one thousand, eight hundred forty-seven".