2639699 has 2 divisors, whose sum is σ = 2639700. Its totient is φ = 2639698.

The previous prime is 2639669. The next prime is 2639701. The reversal of 2639699 is 9969362.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2639699 is a prime.

Together with 2639701, it forms a pair of twin primes.

It is a Chen prime.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319849 + 1319850.

It is an arithmetic number, because the mean of its divisors is an integer number (1319850).

2^2639699 is an apocalyptic number.

2639699 is a deficient number, since it is larger than the sum of its proper divisors (1).

2639699 is an equidigital number, since it uses as much as digits as its factorization.

2639699 is an evil number, because the sum of its binary digits is even.

The product of its digits is 157464, while the sum is 44.

The square root of 2639699 is about 1624.7150519399. The cubic root of 2639699 is about 138.2032117809.

The spelling of 2639699 in words is "two million, six hundred thirty-nine thousand, six hundred ninety-nine".