2539987 has 4 divisors (see below), whose sum is σ = 2689416. Its totient is φ = 2390560.

The previous prime is 2539981. The next prime is 2539997. The reversal of 2539987 is 7899352.

It is a happy number.

2539987 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2539987 is a prime.

It is a super-3 number, since 3×2539987³ = 49160437166663333409, which contains 333 as substring.

It is a d-powerful number, because it can be written as 2¹⁸ + 5⁸ + 3¹² + 9³ + 9⁶ + 8² + 7⁷ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2539981) 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, 74689 + ... + 74722.

It is an arithmetic number, because the mean of its divisors is an integer number (672354).

2^2539987 is an apocalyptic number.

2539987 is a deficient number, since it is larger than the sum of its proper divisors (149429).

2539987 is a wasteful number, since it uses less digits than its factorization.

2539987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149428.

The product of its digits is 136080, while the sum is 43.

The square root of 2539987 is about 1593.7336665830. The cubic root of 2539987 is about 136.4406662027.

The spelling of 2539987 in words is "two million, five hundred thirty-nine thousand, nine hundred eighty-seven".