77369939 has 4 divisors (see below), whose sum is σ = 78136080. Its totient is φ = 76603800.

The previous prime is 77369927. The next prime is 77369947. The reversal of 77369939 is 93996377.

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 77369939 - 2⁸ = 77369683 is a prime.

It is a super-2 number, since 2×77369939² = 11972214921727442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77369909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 382919 + ... + 383120.

It is an arithmetic number, because the mean of its divisors is an integer number (19534020).

Almost surely, 2^77369939 is an apocalyptic number.

77369939 is a deficient number, since it is larger than the sum of its proper divisors (766141).

77369939 is a wasteful number, since it uses less digits than its factorization.

77369939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766140.

The product of its digits is 1928934, while the sum is 53.

The square root of 77369939 is about 8796.0183605993. The cubic root of 77369939 is about 426.1123139834.

The spelling of 77369939 in words is "seventy-seven million, three hundred sixty-nine thousand, nine hundred thirty-nine".