78405347 has 2 divisors, whose sum is σ = 78405348. Its totient is φ = 78405346.

The previous prime is 78405323. The next prime is 78405361. The reversal of 78405347 is 74350487.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78405347 - 2¹² = 78401251 is a prime.

It is a super-2 number, since 2×78405347² = 12294796876380818, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78405347.

It is not a weakly prime, because it can be changed into another prime (78405947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39202673 + 39202674.

It is an arithmetic number, because the mean of its divisors is an integer number (39202674).

Almost surely, 2^78405347 is an apocalyptic number.

78405347 is a deficient number, since it is larger than the sum of its proper divisors (1).

78405347 is an equidigital number, since it uses as much as digits as its factorization.

78405347 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94080, while the sum is 38.

The square root of 78405347 is about 8854.6793843707. The cubic root of 78405347 is about 428.0047219760.

The spelling of 78405347 in words is "seventy-eight million, four hundred five thousand, three hundred forty-seven".