120405144 has 32 divisors (see below), whose sum is σ = 303390720. Its totient is φ = 39818016.

The previous prime is 120405143. The next prime is 120405167. The reversal of 120405144 is 441504021.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 120405144.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120405143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16704 + ... + 22799.

It is an arithmetic number, because the mean of its divisors is an integer number (9480960).

Almost surely, 2^120405144 is an apocalyptic number.

It is an amenable number.

120405144 is an abundant number, since it is smaller than the sum of its proper divisors (182985576).

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

120405144 is a wasteful number, since it uses less digits than its factorization.

120405144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39639 (or 39635 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 120405144 is about 10972.9277770338. The cubic root of 120405144 is about 493.7968863450.

Adding to 120405144 its reverse (441504021), we get a palindrome (561909165).

The spelling of 120405144 in words is "one hundred twenty million, four hundred five thousand, one hundred forty-four".