2398905 has 12 divisors (see below), whose sum is σ = 4158180. Its totient is φ = 1279392.

The previous prime is 2398901. The next prime is 2398919. The reversal of 2398905 is 5098932.

2398905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 788544 + 1610361 = 888^2 + 1269^2 .

It is not a de Polignac number, because 2398905 - 2² = 2398901 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2398905.

It is not an unprimeable number, because it can be changed into a prime (2398901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26610 + ... + 26699.

It is an arithmetic number, because the mean of its divisors is an integer number (346515).

2^2398905 is an apocalyptic number.

It is an amenable number.

2398905 is a deficient number, since it is larger than the sum of its proper divisors (1759275).

2398905 is a wasteful number, since it uses less digits than its factorization.

2398905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53320 (or 53317 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 2398905 is about 1548.8398884326. The cubic root of 2398905 is about 133.8662250000.

The spelling of 2398905 in words is "two million, three hundred ninety-eight thousand, nine hundred five".