78139703 has 2 divisors, whose sum is σ = 78139704. Its totient is φ = 78139702.

The previous prime is 78139693. The next prime is 78139741. The reversal of 78139703 is 30793187.

It is a happy number.

It is an a-pointer prime, because the next prime (78139741) can be obtained adding 78139703 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78139703 - 2¹⁰ = 78138679 is a prime.

It is a super-2 number, since 2×78139703² = 12211626369856418, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78139753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39069851 + 39069852.

It is an arithmetic number, because the mean of its divisors is an integer number (39069852).

Almost surely, 2^78139703 is an apocalyptic number.

78139703 is a deficient number, since it is larger than the sum of its proper divisors (1).

78139703 is an equidigital number, since it uses as much as digits as its factorization.

78139703 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 78139703 is about 8839.6664529834. Note that the first 3 decimals coincide. The cubic root of 78139703 is about 427.5208028818.

The spelling of 78139703 in words is "seventy-eight million, one hundred thirty-nine thousand, seven hundred three".