77829397 has 2 divisors, whose sum is σ = 77829398. Its totient is φ = 77829396.

The previous prime is 77829391. The next prime is 77829407. The reversal of 77829397 is 79392877.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49196196 + 28633201 = 7014^2 + 5351^2 .

It is a cyclic number.

It is not a de Polignac number, because 77829397 - 2¹⁵ = 77796629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77829391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38914698 + 38914699.

It is an arithmetic number, because the mean of its divisors is an integer number (38914699).

Almost surely, 2^77829397 is an apocalyptic number.

It is an amenable number.

77829397 is a deficient number, since it is larger than the sum of its proper divisors (1).

77829397 is an equidigital number, since it uses as much as digits as its factorization.

77829397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1333584, while the sum is 52.

The square root of 77829397 is about 8822.0970862942. The cubic root of 77829397 is about 426.9541329230.

The spelling of 77829397 in words is "seventy-seven million, eight hundred twenty-nine thousand, three hundred ninety-seven".