786641 has 4 divisors (see below), whose sum is σ = 832932. Its totient is φ = 740352.

The previous prime is 786629. The next prime is 786659. The reversal of 786641 is 146687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 146687 = 47 ⋅3121.

It can be written as a sum of positive squares in 2 ways, for example, as 450241 + 336400 = 671^2 + 580^2 .

It is a cyclic number.

It is not a de Polignac number, because 786641 - 2¹⁸ = 524497 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 786598 and 786607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (786661) 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, 23120 + ... + 23153.

It is an arithmetic number, because the mean of its divisors is an integer number (208233).

2⁷⁸⁶⁶⁴¹ is an apocalyptic number.

It is an amenable number.

786641 is a deficient number, since it is larger than the sum of its proper divisors (46291).

786641 is a wasteful number, since it uses less digits than its factorization.

786641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46290.

The product of its digits is 8064, while the sum is 32.

The square root of 786641 is about 886.9278437393. The cubic root of 786641 is about 92.3121485918.

The spelling of 786641 in words is "seven hundred eighty-six thousand, six hundred forty-one".