838521 has 6 divisors (see below), whose sum is σ = 1211210. Its totient is φ = 559008.

The previous prime is 838517. The next prime is 838547. The reversal of 838521 is 125838.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 837225 + 1296 = 915^2 + 36^2 .

It is not a de Polignac number, because 838521 - 2² = 838517 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

838521 is a lucky number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (838561) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46576 + ... + 46593.

2⁸³⁸⁵²¹ is an apocalyptic number.

It is an amenable number.

838521 is a deficient number, since it is larger than the sum of its proper divisors (372689).

838521 is a wasteful number, since it uses less digits than its factorization.

838521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93175 (or 93172 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 838521 is about 915.7079228662. The cubic root of 838521 is about 94.2984703324.

The spelling of 838521 in words is "eight hundred thirty-eight thousand, five hundred twenty-one".