120405904 has 10 divisors (see below), whose sum is σ = 233286470. Its totient is φ = 60202944.

The previous prime is 120405893. The next prime is 120405913. The reversal of 120405904 is 409504021.

It can be written as a sum of positive squares in only one way, i.e., 109830400 + 10575504 = 10480^2 + 3252^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3762669 + ... + 3762700.

It is an arithmetic number, because the mean of its divisors is an integer number (23328647).

Almost surely, 2^120405904 is an apocalyptic number.

It is an amenable number.

120405904 is a deficient number, since it is larger than the sum of its proper divisors (112880566).

120405904 is an equidigital number, since it uses as much as digits as its factorization.

120405904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7525377 (or 7525371 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 120405904 is about 10972.9624076637. The cubic root of 120405904 is about 493.7979252952.

Adding to 120405904 its reverse (409504021), we get a palindrome (529909925).

The spelling of 120405904 in words is "one hundred twenty million, four hundred five thousand, nine hundred four".