77740393 has 2 divisors, whose sum is σ = 77740394. Its totient is φ = 77740392.

The previous prime is 77740361. The next prime is 77740409. The reversal of 77740393 is 39304777.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75898944 + 1841449 = 8712^2 + 1357^2 .

It is an emirp because it is prime and its reverse (39304777) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77740393 - 2⁵ = 77740361 is a prime.

It is not a weakly prime, because it can be changed into another prime (77747393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38870196 + 38870197.

It is an arithmetic number, because the mean of its divisors is an integer number (38870197).

Almost surely, 2^77740393 is an apocalyptic number.

It is an amenable number.

77740393 is a deficient number, since it is larger than the sum of its proper divisors (1).

77740393 is an equidigital number, since it uses as much as digits as its factorization.

77740393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 111132, while the sum is 40.

The square root of 77740393 is about 8817.0512644534. The cubic root of 77740393 is about 426.7913190340.

The spelling of 77740393 in words is "seventy-seven million, seven hundred forty thousand, three hundred ninety-three".