838520149 has 4 divisors (see below), whose sum is σ = 838603360. Its totient is φ = 838436940.

The previous prime is 838520129. The next prime is 838520173. The reversal of 838520149 is 941025838.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 838520149 - 2⁵ = 838520117 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 (838520129) 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, 24009 + ... + 47470.

It is an arithmetic number, because the mean of its divisors is an integer number (209650840).

Almost surely, 2^838520149 is an apocalyptic number.

It is an amenable number.

838520149 is a deficient number, since it is larger than the sum of its proper divisors (83211).

838520149 is a wasteful number, since it uses less digits than its factorization.

838520149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83210.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 838520149 is about 28957.2123831007. The cubic root of 838520149 is about 942.9843843176.

The spelling of 838520149 in words is "eight hundred thirty-eight million, five hundred twenty thousand, one hundred forty-nine".