838661 has 4 divisors (see below), whose sum is σ = 888012. Its totient is φ = 789312.

The previous prime is 838657. The next prime is 838667. The reversal of 838661 is 166838.

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

It can be written as a sum of positive squares in 2 ways, for example, as 776161 + 62500 = 881^2 + 250^2 .

It is a cyclic number.

It is not a de Polignac number, because 838661 - 2² = 838657 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (838667) 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, 24650 + ... + 24683.

It is an arithmetic number, because the mean of its divisors is an integer number (222003).

2⁸³⁸⁶⁶¹ is an apocalyptic number.

It is an amenable number.

838661 is a deficient number, since it is larger than the sum of its proper divisors (49351).

838661 is a wasteful number, since it uses less digits than its factorization.

838661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49350.

The product of its digits is 6912, while the sum is 32.

The square root of 838661 is about 915.7843632646. The cubic root of 838661 is about 94.3037180846.

The spelling of 838661 in words is "eight hundred thirty-eight thousand, six hundred sixty-one".