2539993 has 4 divisors (see below), whose sum is σ = 2546100. Its totient is φ = 2533888.

The previous prime is 2539981. The next prime is 2539997. The reversal of 2539993 is 3999352.

2539993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 831744 + 1708249 = 912^2 + 1307^2 .

It is a cyclic number.

It is not a de Polignac number, because 2539993 - 2⁵ = 2539961 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2539997) 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 3 ways as a sum of consecutive naturals, for example, 2380 + ... + 3277.

It is an arithmetic number, because the mean of its divisors is an integer number (636525).

2^2539993 is an apocalyptic number.

It is an amenable number.

2539993 is a deficient number, since it is larger than the sum of its proper divisors (6107).

2539993 is an equidigital number, since it uses as much as digits as its factorization.

2539993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6106.

The product of its digits is 65610, while the sum is 40.

The square root of 2539993 is about 1593.7355489541. The cubic root of 2539993 is about 136.4407736367.

The spelling of 2539993 in words is "two million, five hundred thirty-nine thousand, nine hundred ninety-three".