201231440 has 80 divisors (see below), whose sum is σ = 483183360. Its totient is φ = 77898240.

The previous prime is 201231427. The next prime is 201231463. The reversal of 201231440 is 44132102.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 409595 + ... + 410085.

It is an arithmetic number, because the mean of its divisors is an integer number (6039792).

Almost surely, 2^201231440 is an apocalyptic number.

201231440 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 201231440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241591680).

201231440 is an abundant number, since it is smaller than the sum of its proper divisors (281951920).

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

201231440 is a wasteful number, since it uses less digits than its factorization.

201231440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660 (or 654 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 201231440 is about 14185.6067899826. The cubic root of 201231440 is about 586.0013434410.

Adding to 201231440 its reverse (44132102), we get a palindrome (245363542).

The spelling of 201231440 in words is "two hundred one million, two hundred thirty-one thousand, four hundred forty".