2609639 has 2 divisors, whose sum is σ = 2609640. Its totient is φ = 2609638.

The previous prime is 2609599. The next prime is 2609657. The reversal of 2609639 is 9369062.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2609639 - 2¹² = 2605543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2609599 and 2609608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2609699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1304819 + 1304820.

It is an arithmetic number, because the mean of its divisors is an integer number (1304820).

2^2609639 is an apocalyptic number.

2609639 is a deficient number, since it is larger than the sum of its proper divisors (1).

2609639 is an equidigital number, since it uses as much as digits as its factorization.

2609639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 2609639 is about 1615.4377115816. The cubic root of 2609639 is about 137.6766039282.

The spelling of 2609639 in words is "two million, six hundred nine thousand, six hundred thirty-nine".