7778423 has 2 divisors, whose sum is σ = 7778424. Its totient is φ = 7778422.

The previous prime is 7778417. The next prime is 7778431. The reversal of 7778423 is 3248777.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7778423 - 2⁸ = 7778167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7778413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3889211 + 3889212.

It is an arithmetic number, because the mean of its divisors is an integer number (3889212).

Almost surely, 2^7778423 is an apocalyptic number.

7778423 is a deficient number, since it is larger than the sum of its proper divisors (1).

7778423 is an equidigital number, since it uses as much as digits as its factorization.

7778423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 65856, while the sum is 38.

The square root of 7778423 is about 2788.9824309235. The cubic root of 7778423 is about 198.1362103937.

The spelling of 7778423 in words is "seven million, seven hundred seventy-eight thousand, four hundred twenty-three".