278523823 has 2 divisors, whose sum is σ = 278523824. Its totient is φ = 278523822.

The previous prime is 278523811. The next prime is 278523829. The reversal of 278523823 is 328325872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 278523823 - 2¹³ = 278515631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278523829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139261911 + 139261912.

It is an arithmetic number, because the mean of its divisors is an integer number (139261912).

Almost surely, 2^278523823 is an apocalyptic number.

278523823 is a deficient number, since it is larger than the sum of its proper divisors (1).

278523823 is an equidigital number, since it uses as much as digits as its factorization.

278523823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 40.

The square root of 278523823 is about 16689.0330157262. The cubic root of 278523823 is about 653.0615516854.

The spelling of 278523823 in words is "two hundred seventy-eight million, five hundred twenty-three thousand, eight hundred twenty-three".