120405889 has 4 divisors (see below), whose sum is σ = 123342660. Its totient is φ = 117469120.

The previous prime is 120405853. The next prime is 120405893. The reversal of 120405889 is 988504021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26471025 + 93934864 = 5145^2 + 9692^2 .

It is a cyclic number.

It is not a de Polignac number, because 120405889 - 2⁹ = 120405377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120409889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1468324 + ... + 1468405.

It is an arithmetic number, because the mean of its divisors is an integer number (30835665).

Almost surely, 2^120405889 is an apocalyptic number.

It is an amenable number.

120405889 is a deficient number, since it is larger than the sum of its proper divisors (2936771).

120405889 is an equidigital number, since it uses as much as digits as its factorization.

120405889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2936770.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 120405889 is about 10972.9617241654. The cubic root of 120405889 is about 493.7979047896.

The spelling of 120405889 in words is "one hundred twenty million, four hundred five thousand, eight hundred eighty-nine".