78461039 has 2 divisors, whose sum is σ = 78461040. Its totient is φ = 78461038.

The previous prime is 78461029. The next prime is 78461077. The reversal of 78461039 is 93016487.

It is an a-pointer prime, because the next prime (78461077) can be obtained adding 78461039 to its sum of digits (38).

It is a weak prime.

It is an emirp because it is prime and its reverse (93016487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78461039 - 2⁴ = 78461023 is a prime.

It is a super-2 number, since 2×78461039² = 12312269281919042, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78460993 and 78461011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78461029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39230519 + 39230520.

It is an arithmetic number, because the mean of its divisors is an integer number (39230520).

Almost surely, 2^78461039 is an apocalyptic number.

78461039 is a deficient number, since it is larger than the sum of its proper divisors (1).

78461039 is an equidigital number, since it uses as much as digits as its factorization.

78461039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 78461039 is about 8857.8236040237. The cubic root of 78461039 is about 428.1060364840.

The spelling of 78461039 in words is "seventy-eight million, four hundred sixty-one thousand, thirty-nine".