2640247 has 8 divisors (see below), whose sum is σ = 2751840. Its totient is φ = 2530080.

The previous prime is 2640227. The next prime is 2640251. The reversal of 2640247 is 7420462.

2640247 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2640247 - 2¹¹ = 2638199 is a prime.

It is a d-powerful number, because it can be written as 2¹⁹ + 6 + 4² + 0 + 2²¹ + 4⁷ + 7⁴ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4998 + ... + 5500.

It is an arithmetic number, because the mean of its divisors is an integer number (343980).

2^2640247 is an apocalyptic number.

2640247 is a deficient number, since it is larger than the sum of its proper divisors (111593).

2640247 is a wasteful number, since it uses less digits than its factorization.

2640247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 2640247 is about 1624.8836881451. The cubic root of 2640247 is about 138.2127747550.

The spelling of 2640247 in words is "two million, six hundred forty thousand, two hundred forty-seven".