78984137 has 2 divisors, whose sum is σ = 78984138. Its totient is φ = 78984136.

The previous prime is 78984131. The next prime is 78984149. The reversal of 78984137 is 73148987.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53743561 + 25240576 = 7331^2 + 5024^2 .

It is an emirp because it is prime and its reverse (73148987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78984137 - 2⁸ = 78983881 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78984091 and 78984100.

It is not a weakly prime, because it can be changed into another prime (78984131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39492068 + 39492069.

It is an arithmetic number, because the mean of its divisors is an integer number (39492069).

Almost surely, 2^78984137 is an apocalyptic number.

It is an amenable number.

78984137 is a deficient number, since it is larger than the sum of its proper divisors (1).

78984137 is an equidigital number, since it uses as much as digits as its factorization.

78984137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 47.

The square root of 78984137 is about 8887.3020090464. The cubic root of 78984137 is about 429.0553211170.

The spelling of 78984137 in words is "seventy-eight million, nine hundred eighty-four thousand, one hundred thirty-seven".