78427403 has 2 divisors, whose sum is σ = 78427404. Its totient is φ = 78427402.

The previous prime is 78427387. The next prime is 78427417. The reversal of 78427403 is 30472487.

It is a strong prime.

It is an emirp because it is prime and its reverse (30472487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78427403 - 2⁴ = 78427387 is a prime.

It is not a weakly prime, because it can be changed into another prime (78427463) 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, 39213701 + 39213702.

It is an arithmetic number, because the mean of its divisors is an integer number (39213702).

Almost surely, 2^78427403 is an apocalyptic number.

78427403 is a deficient number, since it is larger than the sum of its proper divisors (1).

78427403 is an equidigital number, since it uses as much as digits as its factorization.

78427403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37632, while the sum is 35.

The square root of 78427403 is about 8855.9247399693. The cubic root of 78427403 is about 428.0448518373.

The spelling of 78427403 in words is "seventy-eight million, four hundred twenty-seven thousand, four hundred three".