3658287821 has 4 divisors (see below), whose sum is σ = 3667232700. Its totient is φ = 3649342944.

The previous prime is 3658287811. The next prime is 3658287859. The reversal of 3658287821 is 1287828563.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1287828563 = 7 ⋅183975509.

It can be written as a sum of positive squares in 2 ways, for example, as 1694557225 + 1963730596 = 41165^2 + 44314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3658287821 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 3658287821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3658287811) 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, 4471826 + ... + 4472643.

It is an arithmetic number, because the mean of its divisors is an integer number (916808175).

Almost surely, 2^3658287821 is an apocalyptic number.

It is an amenable number.

3658287821 is a deficient number, since it is larger than the sum of its proper divisors (8944879).

3658287821 is an equidigital number, since it uses as much as digits as its factorization.

3658287821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8944878.

The product of its digits is 1290240, while the sum is 50.

The square root of 3658287821 is about 60483.7814707381. The cubic root of 3658287821 is about 1540.8461955722.

The spelling of 3658287821 in words is "three billion, six hundred fifty-eight million, two hundred eighty-seven thousand, eight hundred twenty-one".