786409849 has 9 divisors (see below), whose sum is σ = 815305647. Its totient is φ = 758507064.

The previous prime is 786409831. The next prime is 786409853. The reversal of 786409849 is 948904687.

The square root of 786409849 is 28043.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 412374249 + 374035600 = 20307^2 + 19340^2 .

It is not a de Polignac number, because 786409849 - 2¹¹ = 786407801 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 786409849.

It is not an unprimeable number, because it can be changed into a prime (786409549) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 812764 + ... + 813730.

Almost surely, 2^786409849 is an apocalyptic number.

786409849 is the 28043-rd square number.

786409849 is the 14022-nd centered octagonal number.

It is an amenable number.

786409849 is a deficient number, since it is larger than the sum of its proper divisors (28895798).

786409849 is an frugal number, since it uses more digits than its factorization.

786409849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1992 (or 996 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 55.

The cubic root of 786409849 is about 923.0310586637.

The spelling of 786409849 in words is "seven hundred eighty-six million, four hundred nine thousand, eight hundred forty-nine".