77420039 has 2 divisors, whose sum is σ = 77420040. Its totient is φ = 77420038.

The previous prime is 77419999. The next prime is 77420059. The reversal of 77420039 is 93002477.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (93002477) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77420039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77419987 and 77420014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77420059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38710019 + 38710020.

It is an arithmetic number, because the mean of its divisors is an integer number (38710020).

Almost surely, 2^77420039 is an apocalyptic number.

77420039 is a deficient number, since it is larger than the sum of its proper divisors (1).

77420039 is an equidigital number, since it uses as much as digits as its factorization.

77420039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 77420039 is about 8798.8657791786. The cubic root of 77420039 is about 426.2042688215.

The spelling of 77420039 in words is "seventy-seven million, four hundred twenty thousand, thirty-nine".