4393686461 has 4 divisors (see below), whose sum is σ = 4397064924. Its totient is φ = 4390308000.

The previous prime is 4393686449. The next prime is 4393686463. The reversal of 4393686461 is 1646863934.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 607622500 + 3786063961 = 24650^2 + 61531^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4393686461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4393686463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1687280 + ... + 1689881.

It is an arithmetic number, because the mean of its divisors is an integer number (1099266231).

Almost surely, 2^4393686461 is an apocalyptic number.

It is an amenable number.

4393686461 is a deficient number, since it is larger than the sum of its proper divisors (3378463).

4393686461 is a wasteful number, since it uses less digits than its factorization.

4393686461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3378462.

The product of its digits is 2239488, while the sum is 50.

The square root of 4393686461 is about 66284.8886323271. Note that the first 3 decimals coincide. The cubic root of 4393686461 is about 1637.8584059104.

The spelling of 4393686461 in words is "four billion, three hundred ninety-three million, six hundred eighty-six thousand, four hundred sixty-one".