779540 has 12 divisors (see below), whose sum is σ = 1637076. Its totient is φ = 311808.

The previous prime is 779531. The next prime is 779543. The reversal of 779540 is 45977.

779540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 145924 + 633616 = 382^2 + 796^2 .

It is a super-2 number, since 2×779540² = 1215365223200, which contains 22 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 779497 and 779506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (779543) 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, 19469 + ... + 19508.

It is an arithmetic number, because the mean of its divisors is an integer number (136423).

2⁷⁷⁹⁵⁴⁰ is an apocalyptic number.

It is an amenable number.

779540 is an abundant number, since it is smaller than the sum of its proper divisors (857536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

779540 is a wasteful number, since it uses less digits than its factorization.

779540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38986 (or 38984 counting only the distinct ones).

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 779540 is about 882.9156245078. The cubic root of 779540 is about 92.0335416450.

The spelling of 779540 in words is "seven hundred seventy-nine thousand, five hundred forty".