120531440 has 80 divisors (see below), whose sum is σ = 297302400. Its totient is φ = 45317376.

The previous prime is 120531419. The next prime is 120531443. The reversal of 120531440 is 44135021.

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

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120531443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271859 + ... + 272301.

It is an arithmetic number, because the mean of its divisors is an integer number (3716280).

Almost surely, 2^120531440 is an apocalyptic number.

120531440 is a gapful number since it is divisible by the number (10) 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 120531440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148651200).

120531440 is an abundant number, since it is smaller than the sum of its proper divisors (176770960).

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

120531440 is a wasteful number, since it uses less digits than its factorization.

120531440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654 (or 648 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 120531440 is about 10978.6811594107. The cubic root of 120531440 is about 493.9694780270.

Adding to 120531440 its reverse (44135021), we get a palindrome (164666461).

The spelling of 120531440 in words is "one hundred twenty million, five hundred thirty-one thousand, four hundred forty".