838865681 has 4 divisors (see below), whose sum is σ = 847010112. Its totient is φ = 830721252.

The previous prime is 838865669. The next prime is 838865689. The reversal of 838865681 is 186568838.

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 not a de Polignac number, because 838865681 - 2²² = 834671377 is a prime.

It is a super-2 number, since 2×838865681² = 1407391261519187522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (838865689) 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, 4072061 + ... + 4072266.

It is an arithmetic number, because the mean of its divisors is an integer number (211752528).

Almost surely, 2^838865681 is an apocalyptic number.

It is an amenable number.

838865681 is a deficient number, since it is larger than the sum of its proper divisors (8144431).

838865681 is a wasteful number, since it uses less digits than its factorization.

838865681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8144430.

The product of its digits is 2211840, while the sum is 53.

The square root of 838865681 is about 28963.1780196856. The cubic root of 838865681 is about 943.1138928474.

The spelling of 838865681 in words is "eight hundred thirty-eight million, eight hundred sixty-five thousand, six hundred eighty-one".