2639669 has 2 divisors, whose sum is σ = 2639670. Its totient is φ = 2639668.

The previous prime is 2639639. The next prime is 2639699. The reversal of 2639669 is 9669362.

It is a balanced prime because it is at equal distance from previous prime (2639639) and next prime (2639699).

It can be written as a sum of positive squares in only one way, i.e., 2402500 + 237169 = 1550^2 + 487^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2639669 is a prime.

It is a super-2 number, since 2×2639669² = 13935704859122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2639639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319834 + 1319835.

It is an arithmetic number, because the mean of its divisors is an integer number (1319835).

2^2639669 is an apocalyptic number.

It is an amenable number.

2639669 is a deficient number, since it is larger than the sum of its proper divisors (1).

2639669 is an equidigital number, since it uses as much as digits as its factorization.

2639669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 41.

The square root of 2639669 is about 1624.7058195255. The cubic root of 2639669 is about 138.2026882222.

The spelling of 2639669 in words is "two million, six hundred thirty-nine thousand, six hundred sixty-nine".