2639459 has 4 divisors (see below), whose sum is σ = 2655816. Its totient is φ = 2623104.

The previous prime is 2639447. The next prime is 2639477. The reversal of 2639459 is 9549362.

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-2639459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2639419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7934 + ... + 8259.

It is an arithmetic number, because the mean of its divisors is an integer number (663954).

2^2639459 is an apocalyptic number.

2639459 is a deficient number, since it is larger than the sum of its proper divisors (16357).

2639459 is a wasteful number, since it uses less digits than its factorization.

2639459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16356.

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

The square root of 2639459 is about 1624.6411911558. The cubic root of 2639459 is about 138.1990232003.

Subtracting 2639459 from its reverse (9549362), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 2639459 in words is "two million, six hundred thirty-nine thousand, four hundred fifty-nine".