231123420 has 144 divisors (see below), whose sum is σ = 772323552. Its totient is φ = 55480320.

The previous prime is 231123419. The next prime is 231123421. The reversal of 231123420 is 24321132.

231123420 is a `hidden beast` number, since 231 + 12 + 3 + 420 = 666.

It is an interprime number because it is at equal distance from previous prime (231123419) and next prime (231123421).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 231123393 and 231123402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231123421) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 223224 + ... + 224256.

It is an arithmetic number, because the mean of its divisors is an integer number (5363358).

Almost surely, 2^231123420 is an apocalyptic number.

231123420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231123420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (386161776).

231123420 is an abundant number, since it is smaller than the sum of its proper divisors (541200132).

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

231123420 is a wasteful number, since it uses less digits than its factorization.

231123420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172 (or 1167 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 231123420 is about 15202.7438312957. The cubic root of 231123420 is about 613.6885000521.

Adding to 231123420 its reverse (24321132), we get a palindrome (255444552).

The spelling of 231123420 in words is "two hundred thirty-one million, one hundred twenty-three thousand, four hundred twenty".