3781864321 has 4 divisors (see below), whose sum is σ = 3782044672. Its totient is φ = 3781683972.

The previous prime is 3781864297. The next prime is 3781864369. The reversal of 3781864321 is 1234681873.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3781864321 - 2¹⁹ = 3781340033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3781864381) 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, 53841 + ... + 102286.

It is an arithmetic number, because the mean of its divisors is an integer number (945511168).

Almost surely, 2^3781864321 is an apocalyptic number.

It is an amenable number.

3781864321 is a deficient number, since it is larger than the sum of its proper divisors (180351).

3781864321 is a wasteful number, since it uses less digits than its factorization.

3781864321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180350.

The product of its digits is 193536, while the sum is 43.

The square root of 3781864321 is about 61496.8643184350. The cubic root of 3781864321 is about 1558.0042857072.

The spelling of 3781864321 in words is "three billion, seven hundred eighty-one million, eight hundred sixty-four thousand, three hundred twenty-one".