851238 has 36 divisors (see below), whose sum is σ = 1961388. Its totient is φ = 266760.

The previous prime is 851231. The next prime is 851239. The reversal of 851238 is 832158.

It is a happy number.

It is a super-2 number, since 2×851238² = 1449212265288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851231) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6433 + ... + 6563.

It is an arithmetic number, because the mean of its divisors is an integer number (54483).

2⁸⁵¹²³⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 851238, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (980694).

851238 is an abundant number, since it is smaller than the sum of its proper divisors (1110150).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

851238 is a wasteful number, since it uses less digits than its factorization.

851238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177 (or 155 counting only the distinct ones).

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

The square root of 851238 is about 922.6256012056. The cubic root of 851238 is about 94.7727903537.

It can be divided in two parts, 851 and 238, that added together give a square (1089 = 33²).

The spelling of 851238 in words is "eight hundred fifty-one thousand, two hundred thirty-eight".