838438409 has 4 divisors (see below), whose sum is σ = 844470480. Its totient is φ = 832406340.

The previous prime is 838438399. The next prime is 838438423. The reversal of 838438409 is 904834838.

838438409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-838438409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (838438309) 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, 3015827 + ... + 3016104.

It is an arithmetic number, because the mean of its divisors is an integer number (211117620).

Almost surely, 2^838438409 is an apocalyptic number.

It is an amenable number.

838438409 is a deficient number, since it is larger than the sum of its proper divisors (6032071).

838438409 is a wasteful number, since it uses less digits than its factorization.

838438409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6032070.

The product of its (nonzero) digits is 663552, while the sum is 47.

The square root of 838438409 is about 28955.8009559397. The cubic root of 838438409 is about 942.9537422202.

The spelling of 838438409 in words is "eight hundred thirty-eight million, four hundred thirty-eight thousand, four hundred nine".