78975397 has 2 divisors, whose sum is σ = 78975398. Its totient is φ = 78975396.

The previous prime is 78975373. The next prime is 78975451. The reversal of 78975397 is 79357987.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77334436 + 1640961 = 8794^2 + 1281^2 .

It is a cyclic number.

It is not a de Polignac number, because 78975397 - 2¹⁵ = 78942629 is a prime.

It is a super-2 number, since 2×78975397² = 12474226662615218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78975317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39487698 + 39487699.

It is an arithmetic number, because the mean of its divisors is an integer number (39487699).

Almost surely, 2^78975397 is an apocalyptic number.

It is an amenable number.

78975397 is a deficient number, since it is larger than the sum of its proper divisors (1).

78975397 is an equidigital number, since it uses as much as digits as its factorization.

78975397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3333960, while the sum is 55.

The square root of 78975397 is about 8886.8102826605. The cubic root of 78975397 is about 429.0394948090.

The spelling of 78975397 in words is "seventy-eight million, nine hundred seventy-five thousand, three hundred ninety-seven".