78440903 has 2 divisors, whose sum is σ = 78440904. Its totient is φ = 78440902.

The previous prime is 78440867. The next prime is 78440927. The reversal of 78440903 is 30904487.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78440903 - 2⁸ = 78440647 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78440933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39220451 + 39220452.

It is an arithmetic number, because the mean of its divisors is an integer number (39220452).

Almost surely, 2^78440903 is an apocalyptic number.

78440903 is a deficient number, since it is larger than the sum of its proper divisors (1).

78440903 is an equidigital number, since it uses as much as digits as its factorization.

78440903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 78440903 is about 8856.6869087712. The cubic root of 78440903 is about 428.0694107447.

The spelling of 78440903 in words is "seventy-eight million, four hundred forty thousand, nine hundred three".