838379981 has 4 divisors (see below), whose sum is σ = 839515200. Its totient is φ = 837244764.

The previous prime is 838379947. The next prime is 838380001. The reversal of 838379981 is 189973838.

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-838379981 is a prime.

It is a super-2 number, since 2×838379981² = 1405761985083120722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (838369981) 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, 566501 + ... + 567978.

It is an arithmetic number, because the mean of its divisors is an integer number (209878800).

Almost surely, 2^838379981 is an apocalyptic number.

It is an amenable number.

838379981 is a deficient number, since it is larger than the sum of its proper divisors (1135219).

838379981 is a wasteful number, since it uses less digits than its factorization.

838379981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135218.

The product of its digits is 2612736, while the sum is 56.

The square root of 838379981 is about 28954.7920213563. The cubic root of 838379981 is about 942.9318379354.

The spelling of 838379981 in words is "eight hundred thirty-eight million, three hundred seventy-nine thousand, nine hundred eighty-one".