775977 has 4 divisors (see below), whose sum is σ = 1034640. Its totient is φ = 517316.

The previous prime is 775963. The next prime is 775987. The reversal of 775977 is 779577.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 775977 - 2¹⁵ = 743209 is a prime.

It is a D-number.

775977 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (775937) 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, 129327 + ... + 129332.

It is an arithmetic number, because the mean of its divisors is an integer number (258660).

2⁷⁷⁵⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

775977 is a deficient number, since it is larger than the sum of its proper divisors (258663).

775977 is a wasteful number, since it uses less digits than its factorization.

775977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258662.

The product of its digits is 108045, while the sum is 42.

The square root of 775977 is about 880.8955670226. The cubic root of 775977 is about 91.8931099475.

Subtracting 775977 from its reverse (779577), we obtain a square (3600 = 60²).

The spelling of 775977 in words is "seven hundred seventy-five thousand, nine hundred seventy-seven".