247978223 has 2 divisors, whose sum is σ = 247978224. Its totient is φ = 247978222.

The previous prime is 247978193. The next prime is 247978243. The reversal of 247978223 is 322879742.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 247978223 - 2⁸ = 247977967 is a prime.

It is a super-2 number, since 2×247978223² = 122986398164475458, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247978243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123989111 + 123989112.

It is an arithmetic number, because the mean of its divisors is an integer number (123989112).

Almost surely, 2^247978223 is an apocalyptic number.

247978223 is a deficient number, since it is larger than the sum of its proper divisors (1).

247978223 is an equidigital number, since it uses as much as digits as its factorization.

247978223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 44.

The square root of 247978223 is about 15747.3243124030. The cubic root of 247978223 is about 628.2577401963.

The spelling of 247978223 in words is "two hundred forty-seven million, nine hundred seventy-eight thousand, two hundred twenty-three".