2650639 has 2 divisors, whose sum is σ = 2650640. Its totient is φ = 2650638.

The previous prime is 2650621. The next prime is 2650663. The reversal of 2650639 is 9360562.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2650639 - 2⁹ = 2650127 is a prime.

It is a d-powerful number, because it can be written as 2¹⁷ + 6⁷ + 5⁹ + 0 + 6⁷ + 3⁸ + 9 .

It is a self number, because there is not a number n which added to its sum of digits gives 2650639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2650619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1325319 + 1325320.

It is an arithmetic number, because the mean of its divisors is an integer number (1325320).

2^2650639 is an apocalyptic number.

2650639 is a deficient number, since it is larger than the sum of its proper divisors (1).

2650639 is an equidigital number, since it uses as much as digits as its factorization.

2650639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 2650639 is about 1628.0783150696. The cubic root of 2650639 is about 138.3938723105.

The spelling of 2650639 in words is "two million, six hundred fifty thousand, six hundred thirty-nine".