120431640 has 128 divisors (see below), whose sum is σ = 415134720. Its totient is φ = 27379200.

The previous prime is 120431627. The next prime is 120431651. The reversal of 120431640 is 46134021.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 261010 + ... + 261470.

It is an arithmetic number, because the mean of its divisors is an integer number (3243240).

Almost surely, 2^120431640 is an apocalyptic number.

120431640 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 120431640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207567360).

120431640 is an abundant number, since it is smaller than the sum of its proper divisors (294703080).

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

120431640 is a wasteful number, since it uses less digits than its factorization.

120431640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793 (or 789 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 120431640 is about 10974.1350456425. The cubic root of 120431640 is about 493.8331048493.

Adding to 120431640 its reverse (46134021), we get a palindrome (166565661).

The spelling of 120431640 in words is "one hundred twenty million, four hundred thirty-one thousand, six hundred forty".