278450423 has 2 divisors, whose sum is σ = 278450424. Its totient is φ = 278450422.

The previous prime is 278450387. The next prime is 278450477. The reversal of 278450423 is 324054872.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 278450423 - 2¹² = 278446327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278450023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139225211 + 139225212.

It is an arithmetic number, because the mean of its divisors is an integer number (139225212).

Almost surely, 2^278450423 is an apocalyptic number.

278450423 is a deficient number, since it is larger than the sum of its proper divisors (1).

278450423 is an equidigital number, since it uses as much as digits as its factorization.

278450423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53760, while the sum is 35.

The square root of 278450423 is about 16686.8338219088. The cubic root of 278450423 is about 653.0041790595.

The spelling of 278450423 in words is "two hundred seventy-eight million, four hundred fifty thousand, four hundred twenty-three".