278948983 has 2 divisors, whose sum is σ = 278948984. Its totient is φ = 278948982.

The previous prime is 278948897. The next prime is 278949001. The reversal of 278948983 is 389849872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 278948983 - 2⁹ = 278948471 is a prime.

It is a super-3 number, since 3×278948983³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278948083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139474491 + 139474492.

It is an arithmetic number, because the mean of its divisors is an integer number (139474492).

Almost surely, 2^278948983 is an apocalyptic number.

278948983 is a deficient number, since it is larger than the sum of its proper divisors (1).

278948983 is an equidigital number, since it uses as much as digits as its factorization.

278948983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6967296, while the sum is 58.

The square root of 278948983 is about 16701.7658647222. The cubic root of 278948983 is about 653.3936770643.

The spelling of 278948983 in words is "two hundred seventy-eight million, nine hundred forty-eight thousand, nine hundred eighty-three".