231303420 has 144 divisors (see below), whose sum is σ = 736968960. Its totient is φ = 58641408.

The previous prime is 231303419. The next prime is 231303439. The reversal of 231303420 is 24303132.

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 = 231303393 and 231303402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 380757 + ... + 381363.

It is an arithmetic number, because the mean of its divisors is an integer number (5117840).

Almost surely, 2^231303420 is an apocalyptic number.

231303420 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 231303420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (368484480).

231303420 is an abundant number, since it is smaller than the sum of its proper divisors (505665540).

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

231303420 is a wasteful number, since it uses less digits than its factorization.

231303420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724 (or 719 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 231303420 is about 15208.6626631009. The cubic root of 231303420 is about 613.8477732026.

Adding to 231303420 its reverse (24303132), we get a palindrome (255606552).

The spelling of 231303420 in words is "two hundred thirty-one million, three hundred three thousand, four hundred twenty".