838430819 has 4 divisors (see below), whose sum is σ = 847851480. Its totient is φ = 829010160.

The previous prime is 838430807. The next prime is 838430839. The reversal of 838430819 is 918034838.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-838430819 is a prime.

It is a super-2 number, since 2×838430819² = 1405932476498021522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 838430819.

It is not an unprimeable number, because it can be changed into a prime (838430839) 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, 4710197 + ... + 4710374.

It is an arithmetic number, because the mean of its divisors is an integer number (211962870).

Almost surely, 2^838430819 is an apocalyptic number.

838430819 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

838430819 is a deficient number, since it is larger than the sum of its proper divisors (9420661).

838430819 is an equidigital number, since it uses as much as digits as its factorization.

838430819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9420660.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 838430819 is about 28955.6698938222. The cubic root of 838430819 is about 942.9508968351.

Subtracting from 838430819 its sum of digits (44), we obtain a triangular number (838430775 = T₄₀₉₄₉).

The spelling of 838430819 in words is "eight hundred thirty-eight million, four hundred thirty thousand, eight hundred nineteen".