77338939 has 4 divisors (see below), whose sum is σ = 77546656. Its totient is φ = 77131224.

The previous prime is 77338931. The next prime is 77338957. The reversal of 77338939 is 93983377.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77338939 - 2³ = 77338931 is a prime.

It is a super-2 number, since 2×77338939² = 11962622971291442, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77338892 and 77338901.

It is not an unprimeable number, because it can be changed into a prime (77338931) 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 3 ways as a sum of consecutive naturals, for example, 103299 + ... + 104044.

It is an arithmetic number, because the mean of its divisors is an integer number (19386664).

Almost surely, 2^77338939 is an apocalyptic number.

77338939 is a deficient number, since it is larger than the sum of its proper divisors (207717).

77338939 is a wasteful number, since it uses less digits than its factorization.

77338939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207716.

The product of its digits is 857304, while the sum is 49.

The square root of 77338939 is about 8794.2560231096. The cubic root of 77338939 is about 426.0553958981.

The spelling of 77338939 in words is "seventy-seven million, three hundred thirty-eight thousand, nine hundred thirty-nine".