7780243 has 2 divisors, whose sum is σ = 7780244. Its totient is φ = 7780242.

The previous prime is 7780231. The next prime is 7780259. The reversal of 7780243 is 3420877.

It is a weak prime.

It is an emirp because it is prime and its reverse (3420877) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7780243 is a prime.

It is a super-2 number, since 2×7780243² = 121064362278098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7780043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3890121 + 3890122.

It is an arithmetic number, because the mean of its divisors is an integer number (3890122).

Almost surely, 2^7780243 is an apocalyptic number.

7780243 is a deficient number, since it is larger than the sum of its proper divisors (1).

7780243 is an equidigital number, since it uses as much as digits as its factorization.

7780243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 7780243 is about 2789.3086957166. The cubic root of 7780243 is about 198.1516625311.

It can be divided in two parts, 7780 and 243, that multiplied together give a triangular number (1890540 = T₁₉₄₄).

The spelling of 7780243 in words is "seven million, seven hundred eighty thousand, two hundred forty-three".