2549639 has 4 divisors (see below), whose sum is σ = 2554056. Its totient is φ = 2545224.

The previous prime is 2549623. The next prime is 2549647. The reversal of 2549639 is 9369452.

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

It is a cyclic number.

It is not a de Polignac number, because 2549639 - 2⁴ = 2549623 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2549669) 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 3 ways as a sum of consecutive naturals, for example, 1184 + ... + 2549.

It is an arithmetic number, because the mean of its divisors is an integer number (638514).

2^2549639 is an apocalyptic number.

2549639 is a deficient number, since it is larger than the sum of its proper divisors (4417).

2549639 is an equidigital number, since it uses as much as digits as its factorization.

2549639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4416.

The product of its digits is 58320, while the sum is 38.

The square root of 2549639 is about 1596.7589047818. The cubic root of 2549639 is about 136.6132734783.

The spelling of 2549639 in words is "two million, five hundred forty-nine thousand, six hundred thirty-nine".