78946397 has 2 divisors, whose sum is σ = 78946398. Its totient is φ = 78946396.

The previous prime is 78946393. The next prime is 78946421. The reversal of 78946397 is 79364987.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77810041 + 1136356 = 8821^2 + 1066^2 .

It is a cyclic number.

It is not a de Polignac number, because 78946397 - 2² = 78946393 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78946393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39473198 + 39473199.

It is an arithmetic number, because the mean of its divisors is an integer number (39473199).

Almost surely, 2^78946397 is an apocalyptic number.

It is an amenable number.

78946397 is a deficient number, since it is larger than the sum of its proper divisors (1).

78946397 is an equidigital number, since it uses as much as digits as its factorization.

78946397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 53.

The square root of 78946397 is about 8885.1785013020. The cubic root of 78946397 is about 428.9869735215.

The spelling of 78946397 in words is "seventy-eight million, nine hundred forty-six thousand, three hundred ninety-seven".