231228438 has 64 divisors (see below), whose sum is σ = 553125888. Its totient is φ = 63060480.

The previous prime is 231228433. The next prime is 231228443. The reversal of 231228438 is 834822132.

It is an interprime number because it is at equal distance from previous prime (231228433) and next prime (231228443).

It is a junction number, because it is equal to n+sod(n) for n = 231228399 and 231228408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231228433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79506 + ... + 82362.

It is an arithmetic number, because the mean of its divisors is an integer number (8642592).

Almost surely, 2^231228438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231228438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276562944).

231228438 is an abundant number, since it is smaller than the sum of its proper divisors (321897450).

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

231228438 is a wasteful number, since it uses less digits than its factorization.

231228438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2957.

The product of its digits is 18432, while the sum is 33.

The square root of 231228438 is about 15206.1973550260. The cubic root of 231228438 is about 613.7814353620.

The spelling of 231228438 in words is "two hundred thirty-one million, two hundred twenty-eight thousand, four hundred thirty-eight".