2390905 has 16 divisors (see below), whose sum is σ = 3240000. Its totient is φ = 1677760.

The previous prime is 2390893. The next prime is 2390909. The reversal of 2390905 is 5090932.

2390905 = 253² + 254² + ... + 285².

It is not a de Polignac number, because 2390905 - 2¹³ = 2382713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2390909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 846 + ... + 2344.

It is an arithmetic number, because the mean of its divisors is an integer number (202500).

2^2390905 is an apocalyptic number.

It is an amenable number.

2390905 is a deficient number, since it is larger than the sum of its proper divisors (849095).

2390905 is a wasteful number, since it uses less digits than its factorization.

2390905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 2390905 is about 1546.2551535888. The cubic root of 2390905 is about 133.7172511313.

The spelling of 2390905 in words is "two million, three hundred ninety thousand, nine hundred five".