77997839 has 8 divisors (see below), whose sum is σ = 79107840. Its totient is φ = 76892056.

The previous prime is 77997817. The next prime is 77997841. The reversal of 77997839 is 93879977.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77997839 - 2⁸ = 77997583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77997809) 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 in 7 ways as a sum of consecutive naturals, for example, 59024 + ... + 60330.

It is an arithmetic number, because the mean of its divisors is an integer number (9888480).

Almost surely, 2^77997839 is an apocalyptic number.

77997839 is a deficient number, since it is larger than the sum of its proper divisors (1110001).

77997839 is a wasteful number, since it uses less digits than its factorization.

77997839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2109.

The product of its digits is 6001128, while the sum is 59.

The square root of 77997839 is about 8831.6385229469. The cubic root of 77997839 is about 427.2619223148.

The spelling of 77997839 in words is "seventy-seven million, nine hundred ninety-seven thousand, eight hundred thirty-nine".