431220234540 has 96 divisors (see below), whose sum is σ = 1252349280000. Its totient is φ = 110733702912.

The previous prime is 431220234517. The next prime is 431220234541. The reversal of 431220234540 is 45432022134.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 431220234498 and 431220234507.

It is not an unprimeable number, because it can be changed into a prime (431220234541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 332511 + ... + 986409.

It is an arithmetic number, because the mean of its divisors is an integer number (13045305000).

Almost surely, 2^431220234540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 431220234540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (626174640000).

431220234540 is an abundant number, since it is smaller than the sum of its proper divisors (821129045460).

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

431220234540 is a wasteful number, since it uses less digits than its factorization.

431220234540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654319 (or 654317 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 30.

Adding to 431220234540 its reverse (45432022134), we get a palindrome (476652256674).

The spelling of 431220234540 in words is "four hundred thirty-one billion, two hundred twenty million, two hundred thirty-four thousand, five hundred forty".